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PHP 开发常用代码片段（56例）

发布时间：2020-12-13 17:33:38 所属栏目：PHP教程 来源：网络整理
导读：1. 发送 SMS ? 在开发 Web 或者移动应用的时候，经常会遇到需要发送 SMS 给用户，或者因为登录原因，或者是为了发送信息。下面的 PHP 代码就实现了发送 SMS 的功能。 ? 为了使用任何的语言发送 SMS，需要一个 SMS gateway。大部分的 SMS 会提供一个 API，这

1. 发送 SMS?


在开发 Web 或者移动应用的时候，经常会遇到需要发送 SMS 给用户，或者因为登录原因，或者是为了发送信息。下面的 PHP 代码就实现了发送 SMS 的功能。?
为了使用任何的语言发送 SMS，需要一个 SMS gateway。大部分的 SMS 会提供一个 API，这里是使用?MSG91?作为 SMS gateway。?

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function send_sms($mobile,$msg)
{
$authKey = "XXXXXXXXXXX";
date_default_timezone_set("Asia/Kolkata");
$date = strftime("%Y-%m-%d %H:%M:%S");
//Multiple mobiles numbers separated by comma
$mobileNumber = $mobile;
????????????
//Sender ID,While using route4 sender id should be 6 characters long.
$senderId = "IKOONK";
????????????
//Your message to send,Add URL encoding here.
$message = urlencode($msg);
????????????
//Define route
$route = "template";
//Prepare you post parameters
$postData = array(
???? ‘authkey‘ => $authKey,
???? ‘mobiles‘ => $mobileNumber,
???? ‘message‘ => $message,
???? ‘sender‘ => $senderId,
???? ‘route‘ => $route
);
????????????
//API URL
$url="https://control.msg91.com/sendhttp.php";
????????????
// init the resource
$ch = curl_init();
curl_setopt_array($ch,array(
???? CURLOPT_URL => $url,
???? CURLOPT_RETURNTRANSFER => true,
???? CURLOPT_POST => true,
???? CURLOPT_POSTFIELDS => $postData
???? //,CURLOPT_FOLLOWLOCATION => true
));
????????????
????????????
//Ignore SSL certificate verification
curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,0);
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,0);
????????????
????????????
//get response
$output = curl_exec($ch);
//Print error if any
if(curl_errno($ch))
{
???? echo ‘error:‘ . curl_error($ch);
}
????????????
curl_close($ch);
}

其中“$authKey = "XXXXXXXXXXX";”需要你输入你的密码，“$senderId = "IKOONK";”需要你输入你的 SenderID。当输入移动号码的时候需要指定国家代码 (比如，美国是 1，印度是 91 )。?
语法：?

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<?php
$message = "Hello World";
$mobile = "918112998787";
send_sms($mobile,$message);
?>

2. 使用 mandrill 发送邮件?
Mandrill?是一款强大的 SMTP 提供器。开发者倾向于使用一个第三方 SMTP provider 来获取更好的收件交付。?
下面的函数中，你需要把 “Mandrill.php” 放在同一个文件夹，作为 PHP 文件，这样就可以使用TA来发送邮件。?

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function send_email($to_email,$subject,$message1)
{
require_once ‘Mandrill.php‘;
$apikey = ‘XXXXXXXXXX‘; //specify your api key here
$mandrill = new Mandrill($apikey);
????????????
$message = new stdClass();
$message->html = $message1;
$message->text = $message1;
$message->subject = $subject;
$message->from_email = "[email?protected]";//Sender Email
$message->from_name? = "KOONK";//Sender Name
$message->to = array(array("email" => $to_email));
$message->track_opens = true;
????????????
$response = $mandrill->messages->send($message);
}

$apikey = ‘XXXXXXXXXX‘; //specify your api key here”这里需要你指定你的 API 密钥（从 Mandrill 账户中获得）。?
语法：?

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<?php
$to = "[email?protected]";
$subject = "This is a test email";
$message = "Hello World!";
send_email($to,$message);
?>

为了达到最好的效果，最好按照 Mandrill 的教程去配置 DNS。?

3. PHP 函数：阻止 SQL 注入?
SQL 注入或者 SQLi 常见的攻击网站的手段，使用下面的代码可以帮助你防止这些工具。?

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function clean($input)
{
???? if (is_array($input))
???? {
???????? foreach ($input as $key => $val)
????????? {
???????????? $output[$key] = clean($val);
???????????? // $output[$key] = $this->clean($val);
???????? }
???? }
???? else
???? {
???????? $output = (string) $input;
???????? // if magic quotes is on then use strip slashes
???????? if (get_magic_quotes_gpc())
???????? {
???????????? $output = stripslashes($output);
???????? }
???????? // $output = strip_tags($output);
???????? $output = htmlentities($output,ENT_QUOTES,‘UTF-8‘);
???? }
// return the clean text
???? return $output;
}

语法：?

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<?php
$text = "<script>alert(1)</script>";
$text = clean($text);
echo $text;
?>

4. 检测用户位置?
使用下面的函数，可以检测用户是在哪个城市访问你的网站?

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function detect_city($ip) {
???????????????????
???????? $default = ‘UNKNOWN‘;
????????????
???????? $curlopt_useragent = ‘Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)‘;
???????????????????
???????? $url = ‘http://ipinfodb.com/ip_locator.php?ip=‘ . urlencode($ip);
???????? $ch = curl_init();
???????????????????
???????? $curl_opt = array(
???????????? CURLOPT_FOLLOWLOCATION? => 1,
???????????? CURLOPT_HEADER????? => 0,
???????????? CURLOPT_RETURNTRANSFER? => 1,
???????????? CURLOPT_USERAGENT?? => $curlopt_useragent,
???????????? CURLOPT_URL?????? => $url,
???????????? CURLOPT_TIMEOUT???????? => 1,
???????????? CURLOPT_REFERER???????? => ‘http://‘ . $_SERVER[‘HTTP_HOST‘],
???????? );
???????????????????
???????? curl_setopt_array($ch,$curl_opt);
???????????????????
???????? $content = curl_exec($ch);
???????????????????
???????? if (!is_null($curl_info)) {
???????????? $curl_info = curl_getinfo($ch);
???????? }
???????????????????
???????? curl_close($ch);
???????????????????
???????? if ( preg_match(‘{<li>City : ([^<]*)</li>}i‘,$content,$regs) )? {
???????????? $city = $regs[1];
???????? }
???????? if ( preg_match(‘{<li>State/Province : ([^<]*)</li>}i‘,$regs) )? {
???????????? $state = $regs[1];
???????? }
????????????
???????? if( $city!=‘‘ && $state!=‘‘ ){
?????????? $location = $city . ‘,‘ . $state;
?????????? return $location;
???????? }else{
?????????? return $default;
???????? }
???????????????????
???? }

语法：?

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<?php
$ip = $_SERVER[‘REMOTE_ADDR‘];
$city = detect_city($ip);
echo $city;
?>


5. 获取 Web 页面的源代码?
使用下面的函数，可以获取任意 Web 页面的 HTML 代码?

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function display_sourcecode($url)
{
$lines = file($url);
$output = "";
foreach ($lines as $line_num => $line) {
???? // loop thru each line and prepend line numbers
???? $output.= "Line #<b>{$line_num}</b> : " . htmlspecialchars($line) . "n";
}
}

语法：?

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<?php
$url = "http://blog.koonk.com";
$source = display_sourcecode($url);
echo $source;
?>


6. 计算喜欢你的 Facebook 页面的用户?

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function fb_fan_count($facebook_name)
{
???? $data = json_decode(file_get_contents("https://graph.facebook.com/".$facebook_name));
???? $likes = $data->likes;
???? return $likes;
}

语法：?

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<?php
$page = "koonktechnologies";
$count = fb_fan_count($page);
echo $count;
?>


7. 确定任意图片的主导颜色?

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function dominant_color($image)
{
$i = imagecreatefromjpeg($image);
for ($x=0;$x<imagesx($i);$x++) {
???? for ($y=0;$y<imagesy($i);$y++) {
???????? $rgb = imagecolorat($i,$x,$y);
???????? $r?? = ($rgb >> 16) & 0xFF;
???????? $g?? = ($rgb >>? & 0xFF;
???????? $b?? = $rgb & 0xFF;
???????? $rTotal += $r;
???????? $gTotal += $g;
???????? $bTotal += $b;
???????? $total++;
???? }
}
$rAverage = round($rTotal/$total);
$gAverage = round($gTotal/$total);
$bAverage = round($bTotal/$total);
}


8. whois 查询?
使用下面的函数可以获取任何域名用户的完整细节?

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function whois_query($domain) {
?????????
???? // fix the domain name:
???? $domain = strtolower(trim($domain));
???? $domain = preg_replace(‘/^http:///i‘,‘‘,$domain);
???? $domain = preg_replace(‘/^www./i‘,$domain);
???? $domain = explode(‘/‘,$domain);
???? $domain = trim($domain[0]);
?????????
???? // split the TLD from domain name
???? $_domain = explode(‘.‘,$domain);
???? $lst = count($_domain)-1;
???? $ext = $_domain[$lst];
?????????
???? // You find resources and lists
???? // like these on wikipedia:
???? //
???? // http://de.wikipedia.org/wiki/Whois
???? //
???? $servers = array(
???????? "biz" => "whois.neulevel.biz",
???????? "com" => "whois.internic.net",
???????? "us" => "whois.nic.us",
???????? "coop" => "whois.nic.coop",
???????? "info" => "whois.nic.info",
???????? "name" => "whois.nic.name",
???????? "net" => "whois.internic.net",
???????? "gov" => "whois.nic.gov",
???????? "edu" => "whois.internic.net",
???????? "mil" => "rs.internic.net",
???????? "int" => "whois.iana.org",
???????? "ac" => "whois.nic.ac",
???????? "ae" => "whois.uaenic.ae",
???????? "at" => "whois.ripe.net",
???????? "au" => "whois.aunic.net",
???????? "be" => "whois.dns.be",
???????? "bg" => "whois.ripe.net",
???????? "br" => "whois.registro.br",
???????? "bz" => "whois.belizenic.bz",
???????? "ca" => "whois.cira.ca",
???????? "cc" => "whois.nic.cc",
???????? "ch" => "whois.nic.ch",
???????? "cl" => "whois.nic.cl",
???????? "cn" => "whois.cnnic.net.cn",
???????? "cz" => "whois.nic.cz",
???????? "de" => "whois.nic.de",
???????? "fr" => "whois.nic.fr",
???????? "hu" => "whois.nic.hu",
???????? "ie" => "whois.domainregistry.ie",
???????? "il" => "whois.isoc.org.il",
???????? "in" => "whois.ncst.ernet.in",
???????? "ir" => "whois.nic.ir",
???????? "mc" => "whois.ripe.net",
???????? "to" => "whois.tonic.to",
???????? "tv" => "whois.tv",
???????? "ru" => "whois.ripn.net",
???????? "org" => "whois.pir.org",
???????? "aero" => "whois.information.aero",
???????? "nl" => "whois.domain-registry.nl"
???? );
?????????
???? if (!isset($servers[$ext])){
???????? die(‘Error: No matching nic server found!‘);
???? }
?????????
???? $nic_server = $servers[$ext];
?????????
???? $output = ‘‘;
?????????
???? // connect to whois server:
???? if ($conn = fsockopen ($nic_server,43)) {
???????? fputs($conn,$domain."rn");
???????? while(!feof($conn)) {
???????????? $output .= fgets($conn,128);
???????? }
???????? fclose($conn);
???? }
???? else { die(‘Error: Could not connect to ‘ . $nic_server . ‘!‘); }
?????????
???? return $output;
}


语法：?

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<?php
$domain = "http://www.blog.koonk.com";
$result = whois_query($domain);
print_r($result);
?>


9. 验证邮箱地址?
有时候，当在网站填写表单，用户可能会输入错误的邮箱地址，这个函数可以验证邮箱地址是否有效。?

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function is_validemail($email)
{
$check = 0;
if(filter_var($email,FILTER_VALIDATE_EMAIL))
{
$check = 1;
}
return $check;
}
???????
语法：
<?php
$email = "[email?protected]";
$check = is_validemail($email);
echo $check;
// If the output is 1,then email is valid.
?>

10. 获取用户的真实 ?IP?

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function getRealIpAddr()?
{?
???? if (!emptyempty($_SERVER[‘HTTP_CLIENT_IP‘]))?
???? {?
???????? $ip=$_SERVER[‘HTTP_CLIENT_IP‘];?
???? }?
???? elseif (!emptyempty($_SERVER[‘HTTP_X_FORWARDED_FOR‘]))?
???? //to check ip is pass from proxy?
???? {?
???????? $ip=$_SERVER[‘HTTP_X_FORWARDED_FOR‘];?
???? }?
???? else?
???? {?
???????? $ip=$_SERVER[‘REMOTE_ADDR‘];?
???? }?
???? return $ip;?
}

语法：?

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<?php
$ip = getRealIpAddr();
echo $ip;
?>


11. 转换 URL：从字符串变成超链接?
如果你正在开发论坛，博客或者是一个常规的表单提交，很多时候都要用户访问一个网站。使用这个函数，URL 字符串就可以自动的转换为超链接。?

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function makeClickableLinks($text)
{?
? $text = eregi_replace(‘(((f|ht){1}tp://)[[email?protected]:%_+.~#?&//=]+)‘,?
? ‘<a href="1">1</a>‘,$text);?
? $text = eregi_replace(‘([[:space:]()[{}])(www.[[email?protected]:%_+.~#?&//=]+)‘,?
? ‘1<a href="http://2">2</a>‘,$text);?
? $text = eregi_replace(‘([_.0-9a-z-][email?protected]([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})‘,?
? ‘<a href="mailto:1">1</a>‘,$text);?
?????????
return $text;?
}
??????
语法：
<?php
$text = "This is my first post on http://blog.koonk.com";
$text = makeClickableLinks($text);
echo $text;
?>


12. 阻止多个 IP 访问你的网站?
这个代码片段可以方便你禁止某些特定的 IP 地址访问你的网站?

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if ( !file_exists(‘blocked_ips.txt‘) ) {
? $deny_ips = array(
?? ‘127.0.0.1‘,
?? ‘192.168.1.1‘,
?? ‘83.76.27.9‘,
?? ‘192.168.1.163‘
? );
} else {
? $deny_ips = file(‘blocked_ips.txt‘);
}
// read user ip adress:
$ip = isset($_SERVER[‘REMOTE_ADDR‘]) ? trim($_SERVER[‘REMOTE_ADDR‘]) : ‘‘;
????????
// search current IP in $deny_ips array
if ( (array_search($ip,$deny_ips))!== FALSE ) {
? // address is blocked:
? echo ‘Your IP adress (‘.$ip.‘) was blocked!‘;
? exit;
}


13. 强制性文件下载?
如果你需要下载特定的文件而不用另开新窗口，下面的代码片段可以帮助你。?

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function force_download($file)
{
???? $dir????? = "../log/exports/";
???? if ((isset($file))&&(file_exists($dir.$file))) {
??????? header("Content-type: application/force-download");
??????? header(‘Content-Disposition: inline; filename="‘ . $dir.$file . ‘"‘);
??????? header("Content-Transfer-Encoding: Binary");
??????? header("Content-length: ".filesize($dir.$file));
??????? header(‘Content-Type: application/octet-stream‘);
??????? header(‘Content-Disposition: attachment; filename="‘ . $file . ‘"‘);
??????? readfile("$dir$file");
???? } else {
??????? echo "No file selected";
???? }
}


语法：?

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<php
force_download("image.jpg");
?>


14. 创建 JSON 数据?
使用下面的 PHP 片段可以创建 JSON 数据，可以方便你创建移动应用的 Web 服务?

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$json_data = array (‘id‘=>1,‘name‘=>"Mohit");
echo json_encode($json_data);


15. 压缩 zip 文件?
使用下面的 PHP 片段可以即时压缩 zip 文件?

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function create_zip($files = array(),$destination = ‘‘,$overwrite = false) {?
???? //if the zip file already exists and overwrite is false,return false?
???? if(file_exists($destination) && !$overwrite) { return false; }?
???? //vars?
???? $valid_files = array();?
???? //if files were passed in...?
???? if(is_array($files)) {?
???????? //cycle through each file?
???????? foreach($files as $file) {?
???????????? //make sure the file exists?
???????????? if(file_exists($file)) {?
???????????????? $valid_files[] = $file;?
???????????? }?
???????? }?
???? }?
???? //if we have good files...?
???? if(count($valid_files)) {?
???????? //create the archive?
???????? $zip = new ZipArchive();?
???????? if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) {?
???????????? return false;?
???????? }?
???????? //add the files?
???????? foreach($valid_files as $file) {?
???????????? $zip->addFile($file,$file);?
???????? }?
???????? //debug?
???????? //echo ‘The zip archive contains ‘,$zip->numFiles,‘ files with a status of ‘,$zip->status;?
?????????????????
???????? //close the zip -- done!?
???????? $zip->close();?
?????????????????
???????? //check to make sure the file exists?
???????? return file_exists($destination);?
???? }?
???? else?
???? {?
???????? return false;?
???? }?
}
??????
语法：
<?php
$files=array(‘file1.jpg‘,‘file2.jpg‘,‘file3.gif‘);?
create_zip($files,‘myzipfile.zip‘,true);
?>


16. 解压文件?

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function unzip($location,$newLocation)
{
???????? if(exec("unzip $location",$arr)){
???????????? mkdir($newLocation);
???????????? for($i = 1;$i< count($arr);$i++){
???????????????? $file = trim(preg_replace("~inflating: ~","",$arr[$i]));
???????????????? copy($location.‘/‘.$file,$newLocation.‘/‘.$file);
???????????????? unlink($location.‘/‘.$file);
???????????? }
???????????? return TRUE;
???????? }else{
???????????? return FALSE;
???????? }
}



语法：?

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<?php
unzip(‘test.zip‘,‘unziped/test‘); //File would be unzipped in unziped/test folder
?>


17. 缩放图片?

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function resize_image($filename,$tmpname,$xmax,$ymax)?
{?
???? $ext = explode(".",$filename);?
???? $ext = $ext[count($ext)-1];?
?????????
???? if($ext == "jpg" || $ext == "jpeg")?
???????? $im = imagecreatefromjpeg($tmpname);?
???? elseif($ext == "png")?
???????? $im = imagecreatefrompng($tmpname);?
???? elseif($ext == "gif")?
???????? $im = imagecreatefromgif($tmpname);?
?????????????
???? $x = imagesx($im);?
???? $y = imagesy($im);?
?????????????
???? if($x <= $xmax && $y <= $ymax)?
???????? return $im;?
?????????
???? if($x >= $y) {?
???????? $newx = $xmax;?
???????? $newy = $newx * $y / $x;?
???? }?
???? else {?
???????? $newy = $ymax;?
???????? $newx = $x / $y * $newy;?
???? }?
?????????????
???? $im2 = imagecreatetruecolor($newx,$newy);?
???? imagecopyresized($im2,$im,floor($newx),floor($newy),$y);?
???? return $im2;??
}


18. 使用 mail() 发送邮件?
?之前我们提供了如何使用 Mandrill 发送邮件的 PHP 代码片段，但是如果你不想使用第三方服务，那么可以使用下面的 PHP 代码片段。?

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function send_mail($to,$body)
{
$headers = "From: KOONKrn";
$headers .= "Reply-To: [email?protected]rn";
$headers .= "Return-Path: [email?protected]rn";
$headers .= "X-Mailer: PHP5n";
$headers .= ‘MIME-Version: 1.0‘ . "n";
$headers .= ‘Content-type: text/html; charset=iso-8859-1‘ . "rn";
mail($to,$body,$headers);
}
??????
语法：
<?php
$to = "[email?protected]";
$subject = "This is a test mail";
$body = "Hello World!";
send_mail($to,$body);
?>

19. 把秒转换成天数，小时数和分钟?

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function secsToStr($secs) {
???? if($secs>=86400){$days=floor($secs/86400);$secs=$secs%86400;$r=$days.‘ day‘;if($days<>1){$r.=‘s‘;}if($secs>0){$r.=‘,‘;}}
???? if($secs>=3600){$hours=floor($secs/3600);$secs=$secs%3600;$r.=$hours.‘ hour‘;if($hours<>1){$r.=‘s‘;}if($secs>0){$r.=‘,‘;}}
???? if($secs>=60){$minutes=floor($secs/60);$secs=$secs%60;$r.=$minutes.‘ minute‘;if($minutes<>1){$r.=‘s‘;}if($secs>0){$r.=‘,‘;}}
???? $r.=$secs.‘ second‘;if($secs<>1){$r.=‘s‘;}
???? return $r;
}

语法：?

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<?php
$seconds = "56789";
$output = secsToStr($seconds);
echo $output;
?>

20. 数据库连接?
连接 MySQL 数据库?

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<?php
$DBNAME = ‘koonk‘;
$HOST = ‘localhost‘;
$DBUSER = ‘root‘;
$DBPASS = ‘koonk‘;
$CONNECT = mysql_connect($HOST,$DBUSER,$DBPASS);
if(!$CONNECT)
{
???? echo ‘MySQL Error: ‘.mysql_error();
}
$SELECT = mysql_select_db($DBNAME);
if(!$SELECT)
{
???? echo ‘MySQL Error: ‘.mysql_error();
}
?>

21. 目录清单?
使用下面的 PHP 代码片段可以在一个目录中列出所有文件和文件夹?

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function list_files($dir)
{
???? if(is_dir($dir))
???? {
???????? if($handle = opendir($dir))
???????? {
???????????? while(($file = readdir($handle)) !== false)
???????????? {
???????????????? if($file != "." && $file != ".." && $file != "Thumbs.db"/*pesky windows,images..*/)
???????????????? {
???????????????????? echo ‘<a target="_blank" href="‘.$dir.$file.‘">‘.$file.‘</a>‘."n";
???????????????? }
???????????? }
???????????? closedir($handle);
???????? }
???? }
}


语法：?

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<?php
???? list_files("images/"); //This will list all files of images folder
?>


22. 检测用户语言?
使用下面的 PHP 代码片段可以检测用户浏览器所使用的语言?

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function get_client_language($availableLanguages,$default=‘en‘){
???? if (isset($_SERVER[‘HTTP_ACCEPT_LANGUAGE‘])) {
???????? $langs=explode(‘,‘,$_SERVER[‘HTTP_ACCEPT_LANGUAGE‘]);
???????? foreach ($langs as $value){
???????????? $choice=substr($value,2);
???????????? if(in_array($choice,$availableLanguages)){
???????????????? return $choice;
???????????? }
???????? }
???? }
???? return $default;
}


23. 查看 CSV 文件?

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function readCSV($csvFile){
???? $file_handle = fopen($csvFile,‘r‘);
???? while (!feof($file_handle) ) {
???????? $line_of_text[] = fgetcsv($file_handle,1024);
???? }
???? fclose($file_handle);
???? return $line_of_text;
}
????
语法：
<?php
$csvFile = "test.csv";
$csv = readCSV($csvFile);
$a = csv[0][0]; // This will get value of Column 1 & Row 1
?>


24. 从 PHP 数据创建 CSV 文件?

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function generateCsv($data,$delimiter = ‘,$enclosure = ‘"‘) {
??? $handle = fopen(‘php://temp‘,‘r+‘);
??? foreach ($data as $line) {
??????????? fputcsv($handle,$line,$delimiter,$enclosure);
??? }
??? rewind($handle);
??? while (!feof($handle)) {
??????????? $contents .= fread($handle,8192);
??? }
??? fclose($handle);
??? return $contents;
}
????
语法：
<?php
$data[0] = "apple";
$data[1] = "oranges";
generateCsv($data,$enclosure = ‘"‘);
?>


25. 解析 XML 数据?

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$xml_string="<?xml version=‘1.0‘?>
<moleculedb>
???? <molecule name=‘Benzine‘>
???????? <symbol>ben</symbol>
???????? <code>A</code>
???? </molecule>
???? <molecule name=‘Water‘>
???????? <symbol>h2o</symbol>
???????? <code>K</code>
???? </molecule>
</moleculedb>";
??????
//load the xml string using simplexml function
$xml = simplexml_load_string($xml_string);
??????
//loop through the each node of molecule
foreach ($xml->molecule as $record)
{
??? //attribute are accessted by
??? echo $record[‘name‘],‘? ‘;
??? //node are accessted by -> operator
??? echo $record->symbol,‘? ‘;
??? echo $record->code,‘‘;
}


26. 解析 JSON 数据?

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$json_string=‘{"id":1,"name":"rolf","country":"russia","office":["google","oracle"]} ‘;
$obj=json_decode($json_string);
//print the parsed data
echo $obj->name; //displays rolf
echo $obj->office[0]; //displays google



27. 获取当前页面 URL?
这个 PHP 片段可以帮助你让用户登录后直接跳转到之前浏览的页面?

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function current_url()
{
$url = "http://" . $_SERVER[‘HTTP_HOST‘] . $_SERVER[‘REQUEST_URI‘];
$validURL = str_replace("&","&",$url);
return validURL;
}




语法：?

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<?php
echo "Currently you are on: ".current_url();
?>


28. 从任意的 Twitter 账号获取最新的 Tweet?

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function my_twitter($username)
{
????? $no_of_tweets = 1;
????? $feed = "http://search.twitter.com/search.atom?q=from:" . $username . "&rpp=" . $no_of_tweets;
????? $xml = simplexml_load_file($feed);
???? foreach($xml->children() as $child) {
???????? foreach ($child as $value) {
???????????? if($value->getName() == "link") $link = $value[‘href‘];
???????????? if($value->getName() == "content") {
???????????????? $content = $value . "";
???????? echo ‘<p class="twit">‘.$content.‘ <a class="twt" href="‘.$link.‘" title="">? </a></p>‘;
???????????? }???
???????? }
???? }???
}
????
语法：
<?php
$handle = "koonktech";
my_twitter($handle);
?>


29. 转发数量?
使用这个 PHP 片段可以检测你的页面 URL 有多少转发数量?

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function tweetCount($url) {
???? $content = file_get_contents("http://api.tweetmeme.com/url_info?url=".$url);
???? $element = new SimpleXmlElement($content);
???? $retweets = $element->story->url_count;
???? if($retweets){
???????? return $retweets;
???? } else {
???????? return 0;
???? }
}
????
语法：
<?php
$url = "http://blog.koonk.com";
$count = tweetCount($url);
return $count;
?>


30. 计算两个日期的差?

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<?php
$date1 = date( ‘Y-m-d‘ );
$date2 = "2015-12-04";
$diff = abs(strtotime($date2) - strtotime($date1));
$years = floor($diff / (365*60*60*24));
$months = floor(($diff - $years * 365*60*60*24) / (30*60*60*24));
$days = floor(($diff - $years * 365*60*60*24 - $months*30*60*60*24)/ (60*60*24));
printf("%d years,%d months,%d daysn",$years,$months,$days);
-------------------------------------------------------- OR
$date1 = new DateTime("2007-03-24");
$date2 = new DateTime("2009-06-26");
$interval = $date1->diff($date2);
echo "difference " . $interval->y . " years," . $interval->m." months,".$interval->d." days ";
// shows the total amount of days (not divided into years,months and days like above)
echo "difference " . $interval->days . " days ";
-------------------------------------------------------- OR
?????????
?????????
/**
? * Calculate differences between two dates with precise semantics. Based on PHPs DateTime::diff()
? * implementation by Derick Rethans. Ported to PHP by Emil H,2011-05-02. No rights reserved.
? *
? * See here for original code:
? * http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/tm2unixtime.c?revision=302890&view=markup
? * http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/interval.c?revision=298973&view=markup
? */
function _date_range_limit($start,$end,$adj,$a,$b,$result)
{
???? if ($result[$a] < $start) {
???????? $result[$b] -= intval(($start - $result[$a] - 1) / $adj) + 1;
???????? $result[$a] += $adj * intval(($start - $result[$a] - 1) / $adj + 1);
???? }
???? if ($result[$a] >= $end) {
???????? $result[$b] += intval($result[$a] / $adj);
???????? $result[$a] -= $adj * intval($result[$a] / $adj);
???? }
???? return $result;
}
function _date_range_limit_days($base,$result)
{
???? $days_in_month_leap = array(31,31,29,30,31);
???? $days_in_month = array(31,28,31);
???? _date_range_limit(1,13,12,"m","y",&$base);
???? $year = $base["y"];
???? $month = $base["m"];
???? if (!$result["invert"]) {
???????? while ($result["d"] < 0) {
???????????? $month--;
???????????? if ($month < 1) {
???????????????? $month += 12;
???????????????? $year--;
???????????? }
???????????? $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0);
???????????? $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month];
???????????? $result["d"] += $days;
???????????? $result["m"]--;
???????? }
???? } else {
???????? while ($result["d"] < 0) {
???????????? $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0);
???????????? $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month];
???????????? $result["d"] += $days;
???????????? $result["m"]--;
???????????? $month++;
???????????? if ($month > 12) {
???????????????? $month -= 12;
???????????????? $year++;
???????????? }
???????? }
???? }
???? return $result;
}
function _date_normalize($base,$result)
{
???? $result = _date_range_limit(0,60,"s","i",$result);
???? $result = _date_range_limit(0,"h",$result);
???? $result = _date_range_limit(0,24,"d",$result);
???? $result = _date_range_limit(0,$result);
???? $result = _date_range_limit_days(&$base,&$result);
???? $result = _date_range_limit(0,$result);
???? return $result;
}
/**
? * Accepts two unix timestamps.
? */
function _date_diff($one,$two)
{
???? $invert = false;
???? if ($one > $two) {
???????? list($one,$two) = array($two,$one);
???????? $invert = true;
???? }
???? $key = array("y","s");
???? $a = array_combine($key,array_map("intval",explode(" ",date("Y m d H i s",$one))));
???? $b = array_combine($key,$two))));
???? $result = array();
???? $result["y"] = $b["y"] - $a["y"];
???? $result["m"] = $b["m"] - $a["m"];
???? $result["d"] = $b["d"] - $a["d"];
???? $result["h"] = $b["h"] - $a["h"];
???? $result["i"] = $b["i"] - $a["i"];
???? $result["s"] = $b["s"] - $a["s"];
???? $result["invert"] = $invert ? 1 : 0;
???? $result["days"] = intval(abs(($one - $two)/86400));
???? if ($invert) {
???????? _date_normalize(&$a,&$result);
???? } else {
???????? _date_normalize(&$b,&$result);
???? }
???? return $result;
}
$date = "2014-12-04 19:37:22";
echo ‘<pre>‘;
print_r( _date_diff( strtotime($date),time() ) );
echo ‘</pre>‘;
?>

31. 删除文件夹内容?

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function Delete($path)
{
???? if (is_dir($path) === true)
???? {
???????? $files = array_diff(scandir($path),array(‘.‘,‘..‘));
???????? foreach ($files as $file)
???????? {
???????????? Delete(realpath($path) . ‘/‘ . $file);
???????? }
???????? return rmdir($path);
???? }
???? else if (is_file($path) === true)
???? {
???????? return unlink($path);
???? }
???? return false;
}


语法：?

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<?php
$path = "images/";
Delete($path); // This will delete images folder along with its contents.
?>


32. 搜索和高亮字符串中的关键字?

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function highlighter_text($text,$words)
{
???? $split_words = explode( " ",$words );
???? foreach($split_words as $word)
???? {
???????? $color = "#4285F4";
???????? $text = preg_replace("|($word)|Ui",
???????????? "<span style="color:".$color.";"><b>$1</b></span>",$text );
???? }
???? return $text;
}

语法：?

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<?php
$string = "I like chocolates and I like apples";
$words = "apple";
echo highlighter_text($string,$words);
?>




33. 写入文件?

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<?
$filename = ‘blog.csv‘;
$fp = fopen($filename,‘w‘);
$output = " Hello ";
$output .= " World! ";
$output .= "rn";
fputs($fp,$output);
fclose($fp);
?>


34. 根据 URL 下载图片?

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function imagefromURL($image,$rename)
{
$ch = curl_init($image);
curl_setopt($ch,CURLOPT_HEADER,0);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch,CURLOPT_BINARYTRANSFER,1);
$rawdata=curl_exec ($ch);
curl_close ($ch);
$fp = fopen("$rename",‘w‘);
fwrite($fp,$rawdata);
fclose($fp);
}


语法：?

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<?php
$url = "http://koonk.com/images/logo.png";
$rename = "koonk.png";
imagefromURL($url,$rename);
?>


35. 检测 URL 是否有效?

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function isvalidURL($url)
{
$check = 0;
if (filter_var($url,FILTER_VALIDATE_URL) !== false) {
?? $check = 1;
}
return $check;
}
??
语法：
<?php
$url = "http://koonk.com";
$check = checkvalidURL($url);
echo $check; //if returns 1 then URL is valid.
?>


36. 生成二维码?

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function qr_code($data,$type = "TXT",$size =‘150‘,$ec=‘L‘,$margin=‘0‘)?
{
????? $types = array("URL" =--> "http://","TEL" => "TEL:","TXT"=>"","EMAIL" => "MAILTO:");
???? if(!in_array($type,array("URL","TEL","TXT","EMAIL")))
???? {
???????? $type = "TXT";
???? }
???? if (!preg_match(‘/^‘.$types[$type].‘/‘,$data))
???? {
???????? $data = str_replace("",$types[$type]).$data;
???? }
???? $ch = curl_init();
???? $data = urlencode($data);
???? curl_setopt($ch,CURLOPT_URL,‘http://chart.apis.google.com/chart‘);
???? curl_setopt($ch,CURLOPT_POST,true);
???? curl_setopt($ch,CURLOPT_POSTFIELDS,‘chs=‘.$size.‘x‘.$size.‘&cht=qr&chld=‘.$ec.‘|‘.$margin.‘&chl=‘.$data);
???? curl_setopt($ch,true);
???? curl_setopt($ch,false);
???? curl_setopt($ch,CURLOPT_TIMEOUT,30);
???? $response = curl_exec($ch);
???? curl_close($ch);
???? return $response;
}


语法：?

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<?php
header("Content-type: image/png");
echo qr_code("http://koonk.com","URL");
?>


37. 计算两个地图坐标之间的距离?

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function getDistanceBetweenPointsNew($latitude1,$longitude1,$latitude2,$longitude2) {
???? $theta = $longitude1 - $longitude2;
???? $miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta)));
???? $miles = acos($miles);
???? $miles = rad2deg($miles);
???? $miles = $miles * 60 * 1.1515;
???? $feet = $miles * 5280;
???? $yards = $feet / 3;
???? $kilometers = $miles * 1.609344;
???? $meters = $kilometers * 1000;
???? return compact(‘miles‘,‘feet‘,‘yards‘,‘kilometers‘,‘meters‘);
}


语法：?

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<?php
$point1 = array(‘lat‘ => 40.770623,‘long‘ => -73.964367);
$point2 = array(‘lat‘ => 40.758224,‘long‘ => -73.917404);
$distance = getDistanceBetweenPointsNew($point1[‘lat‘],$point1[‘long‘],$point2[‘lat‘],$point2[‘long‘]);
foreach ($distance as $unit => $value) {
???? echo $unit.‘: ‘.number_format($value,4).‘‘;
}
?>


38. 获取一个特定话题标签的所有 Tweets?

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function getTweets($hash_tag) {
???? $url = ‘http://search.twitter.com/search.atom?q=‘.urlencode($hash_tag) ;
???? echo "<p>Connecting to <strong>$url</strong> ...</p>";
???? $ch = curl_init($url);
???? curl_setopt ($ch,TRUE);
???? $xml = curl_exec ($ch);
???? curl_close ($ch);
???? //If you want to see the response from Twitter,uncomment this next part out:
???? //echo "<p>Response:</p>";
???? //echo "<pre>".htmlspecialchars($xml)."</pre>";
???? $affected = 0;
???? $twelement = new SimpleXMLElement($xml);
???? foreach ($twelement->entry as $entry) {
???????? $text = trim($entry->title);
???????? $author = trim($entry->author->name);
???????? $time = strtotime($entry->published);
???????? $id = $entry->id;
???????? echo "<p>Tweet from ".$author.": <strong>".$text."</strong>? <em>Posted ".date(‘n/j/y g:i a‘,$time)."</em></p>";
???? }
???? return true ;
}


39. 添加 th,st,nd 或者 rd 作为数字的后缀?

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Friday the 13th
function ordinal($cdnl){
???? $test_c = abs($cdnl) % 10;
???? $ext = ((abs($cdnl) %100 < 21 && abs($cdnl) %100 > 4) ? ‘th‘
???????????? : (($test_c < 4) ? ($test_c < 3) ? ($test_c < 2) ? ($test_c < 1)
???????????? ? ‘th‘ : ‘st‘ : ‘nd‘ : ‘rd‘ : ‘th‘));
???? return $cdnl.$ext;
}

语法：?

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<?php
$number = 10;
echo ordinal($number); //output is 10th
?>


40. 限制文件下载的速度?

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<?php
// local file that should be send to the client
$local_file = ‘test-file.zip‘;
// filename that the user gets as default
$download_file = ‘your-download-name.zip‘;
????
// set the download rate limit (=> 20,5 kb/s)
$download_rate = 20.5;
if(file_exists($local_file) && is_file($local_file)) {
???? // send headers
???? header(‘Cache-control: private‘);
???? header(‘Content-Type: application/octet-stream‘);
???? header(‘Content-Length: ‘.filesize($local_file));
???? header(‘Content-Disposition: filename=‘.$download_file);
????
???? // flush content
???? flush();???
???? // open file stream
???? $file = fopen($local_file,"r");???
???? while(!feof($file)) {
????
???????? // send the current file part to the browser
???????? print fread($file,round($download_rate * 1024));???
????
???????? // flush the content to the browser
???????? flush();
????
???????? // sleep one second
???????? sleep(1);???
???? }???
????
???? // close file stream
???? fclose($file);}
else {
???? die(‘Error: The file ‘.$local_file.‘ does not exist!‘);
}
?>


41. 把文本转换成图片?

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<?php
header("Content-type: image/png");
$string = $_GET[‘text‘];
$im = imagecreatefrompng("images/button.png");
$color = imagecolorallocate($im,255,255);
$px = (imagesx($im) - 7.5 * strlen($string)) / 2;
$py = 9;
$fontSize = 1;
imagestring($im,fontSize,$px,$py,$string,$color);
imagepng($im);
imagedestroy($im);
?>


42. 获取远程文件的大小?

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function remote_filesize($url,$user = "",$pw = "")
{
???? ob_start();
???? $ch = curl_init($url);
???? curl_setopt($ch,1);
???? curl_setopt($ch,CURLOPT_NOBODY,1);
???? if(!empty($user) && !empty($pw))
???? {
???????? $headers = array(‘Authorization: Basic ‘ .? base64_encode("$user:$pw"));
???????? curl_setopt($ch,CURLOPT_HTTPHEADER,$headers);
???? }
???? $ok = curl_exec($ch);
???? curl_close($ch);
???? $head = ob_get_contents();
???? ob_end_clean();
???? $regex = ‘/Content-Length:s([0-9].+?)s/‘;
???? $count = preg_match($regex,$head,$matches);
???? return isset($matches[1]) ? $matches[1] : "unknown";
}


语法：?

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<?php
$file = "http://koonk.com/images/logo.png";
$size = remote_filesize($url);
echo $size;
?>


43. 使用 imagebrick 进行 pdf 到图像的转换?

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<?php
$pdf_file?? = ‘./pdf/demo.pdf‘;
$save_to??? = ‘./jpg/demo.jpg‘;???? //make sure that apache has permissions to write in this folder! (common problem)
//execute ImageMagick command ‘convert‘ and convert PDF to JPG with applied settings
exec(‘convert "‘.$pdf_file.‘" -colorspace RGB -resize 800 "‘.$save_to.‘"‘,$output,$return_var);
if($return_var == 0) {????????????? //if exec successfuly converted pdf to jpg
???? print "Conversion OK";
}
else print "Conversion failed.".$output;
?>


44. 使用 tinyurl 生成短网址?

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function get_tiny_url($url)?
{?
???? $ch = curl_init();?
???? $timeout = 5;?
???? curl_setopt($ch,‘http://tinyurl.com/api-create.php?url=‘.$url);?
???? curl_setopt($ch,1);?
???? curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout);?
???? $data = curl_exec($ch);?
???? curl_close($ch);?
???? return $data;?
}


语法：?

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<?php
$url = "http://blog.koonk.com/2015/07/Hello-World";
$tinyurl = get_tiny_url($url);
echo $tinyurl;
?>


45. youtube 下载链接生成器?
使用下面的 PHP 片段可以让你的用户下载 Youtube 视频?

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function str_between($string,$start,$end)
{
$string = " ".$string; $ini = strpos($string,$start); if ($ini == 0) return ""; $ini += strlen($start); $len = strpos($string,$ini) - $ini; return substr($string,$ini,$len); }
function get_youtube_download_link(){
???? $youtube_link = $_GET[‘youtube‘];
???? $youtube_page = file_get_contents($youtube_link);
???? $v_id = str_between($youtube_page,"&video_id=","&");
???? $t_id = str_between($youtube_page,"&t=","&");
???? $flv_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id";
???? $hq_flv_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=6";
???? $mp4_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=18";
???? $threegp_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=17";
???? echo "ttDownload (right-click > save as):ntt";
???? echo "<a href="$flv_link">FLV</a>ntt";
???? echo "<a href="$hq_flv_link">HQ FLV (if available)</a>ntt";
???? echo "<a href="$mp4_link">MP4</a>ntt";
???? echo "<a href="$threegp_link">3GP</a>n";
}


46. Facebook 样式的时间戳?

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Facebook (x mins age,y hours ago etc)
function nicetime($date)
{
???? if(empty($date)) {
???????? return "No date provided";
???? }
???????
???? $periods???????? = array("second","minute","hour","day","week","month","year","decade");
???? $lengths???????? = array("60","60","24","7","4.35","12","10");
???????
???? $now???????????? = time();
???? $unix_date???????? = strtotime($date);
???????
??????? // check validity of date
???? if(empty($unix_date)) {???
???????? return "Bad date";
???? }
???? // is it future date or past date
???? if($now > $unix_date) {???
???????? $difference???? = $now - $unix_date;
???????? $tense???????? = "ago";
???????????
???? } else {
???????? $difference???? = $unix_date - $now;
???????? $tense???????? = "from now";
???? }
???????
???? for($j = 0; $difference >= $lengths[$j] && $j < count($lengths)-1; $j++) {
???????? $difference /= $lengths[$j];
???? }
???????
???? $difference = round($difference);
???????
???? if($difference != 1) {
???????? $periods[$j].= "s";
???? }
???????
???? return "$difference $periods[$j] {$tense}";
}

语法：?

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<?php
$date = "2015-07-05 03:45";
$result = nicetime($date); // 2 days ago
?>


47、黑名单过滤

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function is_spam( $text , $file , $split = ‘:‘ , $regex = false){
???? $handle = fopen ( $file , ‘rb‘ );
???? $contents = fread ( $handle , filesize ( $file ));
???? fclose( $handle );
???? $lines = explode ( "n" , $contents );
???? $arr = array ();
???? foreach ( $lines as $line ){
???????? list( $word , $count ) = explode ( $split , $line );
???????? if ( $regex )
???????????? $arr [ $word ] = $count ;
???????? else
???????????? $arr [preg_quote( $word )] = $count ;
???? }
???? preg_match_all( "~" .implode( ‘|‘ , array_keys ( $arr )). "~" , $text , $matches );
???? $temp = array ();
???? foreach ( $matches [0] as $match ){
???????? if (!in_array( $match , $temp )){
???????????? $temp [ $match ] = $temp [ $match ] + 1;
???????????? if ( $temp [ $match ] >= $arr [ $word ])
???????????????? return true;
???????? }
???? }
???? return false;
}
?
$file = ‘spam.txt‘ ;
$str = ‘This string has cat,dog word‘ ;
if (is_spam( $str , $file ))
???? echo ‘this is spam‘ ;
else
???? echo ‘this is not spam‘ ;

输出：

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ab:3
dog:3
cat:2
monkey:2

48、随机颜色生成器

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function randomColor() {
???? $str = ‘#‘ ;
???? for ( $i = 0 ; $i < 6 ; $i ++) {
???????? $randNum = rand(0,15);
???????? switch ( $randNum ) {
???????????? case 10: $randNum = ‘A‘ ; break ;
???????????? case 11: $randNum = ‘B‘ ; break ;
???????????? case 12: $randNum = ‘C‘ ; break ;
???????????? case 13: $randNum = ‘D‘ ; break ;
???????????? case 14: $randNum = ‘E‘ ; break ;
???????????? case 15: $randNum = ‘F‘ ; break ;
???????? }
???????? $str .= $randNum ;
???? }
???? return $str ;
}
$color = randomColor();

49、从网络下载文件

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set_time_limit(0);
// Supports all file types
// URL Here:
$url = ‘http://somsite.com/some_video.flv‘ ;
$pi = pathinfo ( $url );
$ext = $pi [ ‘extension‘ ];
$name = $pi [ ‘filename‘ ];
?
// create a new cURL resource
$ch = curl_init();
?
// set URL and other appropriate options
curl_setopt( $ch , $url );
curl_setopt( $ch ,false);
curl_setopt( $ch ,true);
curl_setopt( $ch ,CURLOPT_AUTOREFERER,true);
curl_setopt( $ch ,CURLOPT_FOLLOWLOCATION,true);
curl_setopt( $ch ,true);
?
// grab URL and pass it to the browser
$opt = curl_exec( $ch );
?
// close cURL resource,and free up system resources
curl_close( $ch );
?
$saveFile = $name . ‘.‘ . $ext ;
if (preg_match( "/[^0-9a-z._-]/i" , $saveFile ))
$saveFile = md5(microtime(true)). ‘.‘ . $ext ;
?
$handle = fopen ( $saveFile , ‘wb‘ );
fwrite( $handle , $opt );
fclose( $handle );

50、Alexa/Google Page Rank

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function page_rank( $page , $type = ‘alexa‘ ){
???? switch ( $type ){
???????? case ‘alexa‘ :
???????????? $url = ‘http://alexa.com/siteinfo/‘ ;
???????????? $handle = fopen ( $url . $page , ‘r‘ );
???????????? break ;
???????? case ‘google‘ :
???????????? $url = ‘http://google.com/search?client=navclient-auto&ch=6-1484155081&features=Rank&q=info:‘ ;
???????????? $handle = fopen ( $url . ‘http://‘ . $page , ‘r‘ );
???????????? break ;
???? }
???? $content = stream_get_contents( $handle );
???? fclose( $handle );
???? $content = preg_replace( "~(n|t|ss+)~" , ‘‘ , $content );
???? switch ( $type ){
???????? case ‘alexa‘ :
???????????? if (preg_match( ‘~<div class="data (down|up)"><img.+?>(.+?) </div>~im‘ , $content , $matches )){
???????????????? return $matches [2];
???????????? } else {
???????????? return FALSE;
???????????? }
???????????? break ;
???????? case ‘google‘ :
???????????? $rank = explode ( ‘:‘ , $content );
???????????? if ( $rank [2] != ‘‘ )
???????????????? return $rank [2];
???????????? else
???????????????? return FALSE;
???????????? break ;
???????? default :
???????????? return FALSE;
???????????? break ;
???? }
}
// Alexa Page Rank:
echo ‘Alexa Rank: ‘ .page_rank( ‘techug.com‘ );
echo ‘
‘;
// Google Page Rank
echo ‘Google Rank: ‘ .page_rank( ‘techug.com‘ , ‘google‘ );

51、强制下载文件

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$filename = $_GET [ ‘file‘ ]; //Get the fileid from the URL
// Query the file ID
$query = sprintf( "SELECT * FROM tableName WHERE id = ‘%s‘" ,mysql_real_escape_string( $filename ));
$sql = mysql_query( $query );
if (mysql_num_rows( $sql ) > 0){
???? $row = mysql_fetch_array( $sql );
???? // Set some headers
???? header( "Pragma: public" );
???? header( "Expires: 0" );
???? header( "Cache-Control: must-revalidate,post-check=0,pre-check=0" );
???? header( "Content-Type: application/force-download" );
???? header( "Content-Type: application/octet-stream" );
???? header( "Content-Type: application/download" );
???? header( "Content-Disposition: attachment; filename=" . basename ( $row [ ‘FileName‘ ]). ";" );
???? header( "Content-Transfer-Encoding: binary" );
???? header( "Content-Length: " . filesize ( $row [ ‘FileName‘ ]));
?
???? @readfile( $row [ ‘FileName‘ ]);
???? exit (0);
} else {
???? header( "Location: /" );
???? exit ;
}

52、通过Email显示用户的Gravatar头像

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$gravatar_link = ‘http://www.gravatar.com/avatar/‘ . md5( $comment_author_email ) . ‘?s=32‘ ;
echo ‘<lt;img src="‘ . $gravatar_link . ‘" />‘ ;

53、通过cURL获取RSS订阅数

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$ch = curl_init();
curl_setopt( $ch , ‘https://feedburner.google.com/api/awareness/1.0/GetFeedData?id=7qkrmib4r9rscbplq5qgadiiq4‘ );
curl_setopt( $ch ,1);
curl_setopt( $ch ,2);
$content = curl_exec( $ch );
$subscribers = get_match( ‘/circulation="(.*)"/isU‘ , $content );
curl_close( $ch );

54、时间差异计算函数

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function ago( $time )
{
???? $periods = array ( "second" , "minute" , "hour" , "day" , "week" , "month" , "year" , "decade" );
???? $lengths = array ( "60" , "60" , "24" , "7" , "4.35" , "12" , "10" );
???? $now = time();
???? $difference = $now - $time ;
???? $tense = "ago" ;
???? for ( $j = 0; $difference >= $lengths [ $j ] && $j < count ( $lengths )-1; $j ++) {
???????? $difference /= $lengths [ $j ];
???? }
???? $difference = round ( $difference );
???? if ( $difference != 1) {
???????? $periods [ $j ].= "s" ;
???? }
???? return "$difference $periods[$j] ‘ago‘ " ;
}

55、裁剪图片

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$filename = "test.jpg" ;
list( $w , $h , $type , $attr ) = getimagesize ( $filename );
$src_im = imagecreatefromjpeg( $filename );
?
$src_x = ‘0‘ ; // begin x
$src_y = ‘0‘ ; // begin y
$src_w = ‘100‘ ; // width
$src_h = ‘100‘ ; // height
$dst_x = ‘0‘ ; // destination x
$dst_y = ‘0‘ ; // destination y
?
$dst_im = imagecreatetruecolor( $src_w , $src_h );
$white = imagecolorallocate( $dst_im ,255);
imagefill( $dst_im , $white );
?
imagecopy( $dst_im , $src_im , $dst_x , $dst_y , $src_x , $src_y , $src_w , $src_h );
?
header( "Content-type: image/png" );
imagepng( $dst_im );
imagedestroy( $dst_im );

56、检查网站是否宕机

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function Visit( $url ){
???? $agent = "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)" ; $ch =curl_init();
???? curl_setopt ( $ch , $url );
???? curl_setopt( $ch ,CURLOPT_USERAGENT, $agent );
???? curl_setopt ( $ch ,1);
???? curl_setopt ( $ch ,CURLOPT_VERBOSE,false);
???? curl_setopt( $ch ,5);
???? curl_setopt( $ch ,FALSE);
???? curl_setopt( $ch ,CURLOPT_SSLVERSION,3);
???? curl_setopt( $ch ,FALSE);
???? $page =curl_exec( $ch );
???? //echo curl_error($ch);
???? $httpcode = curl_getinfo( $ch ,CURLINFO_HTTP_CODE);
???? curl_close( $ch );
???? if ( $httpcode >=200 && $httpcode <300) return true;
???? else return false;
}
if (Visit( "http://www.google.com" ))
???? echo "Website OK" . "n" ;
else
???? echo "Website DOWN" ;

（编辑：李大同）

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