- 可阅读随机字符串 此代码将创建一个可阅读的字符串，使其更接近词典中的单词，实用且具有密码验证功能。
<div class="codetitle"><a style="CURSOR: pointer" data="55492" class="copybut" id="copybut55492" onclick="doCopy('code55492')"> 代码如下:<div class="codebody" id="code55492">
/**
*@length - length of random string (must be a multiple of 2)
**/
function readable_random_string($length = 6){
$conso=array("b","c","d","f","g","h","j","k","l",
"m","n","p","r","s","t","v","w","x","y","z");
$vocal=array("a","e","i","o","u");
$password="";
srand ((double)microtime()*1000000);
$max = $length/2;
for($i=1; $i<=$max; $i++)
{
$password.=$conso[rand(0,19)];
$password.=$vocal[rand(0,4)];
}
return $password;
}
2. 生成一个随机字符串 如果不需要可阅读的字符串，使用此函数替代，即可创建一个随机字符串，作为用户的随机密码等。
<div class="codetitle"><a style="CURSOR: pointer" data="47206" class="copybut" id="copybut47206" onclick="doCopy('code47206')"> 代码如下:<div class="codebody" id="code47206">
/
@l - length of random string
/
function generate_rand($l){
$c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
srand((double)microtime()1000000);
for($i=0; $i<$l; $i++) {
$rand.= $c[rand()%strlen($c)];
}
return $rand;
}
3. 编码电子邮件地址 使用此代码，可以将任何电子邮件地址编码为 HTML 字符实体，以防止被垃圾邮件程序收集。
<div class="codetitle"><a style="CURSOR: pointer" data="25180" class="copybut" id="copybut25180" onclick="doCopy('code25180')"> 代码如下:<div class="codebody" id="code25180">
function encode_email($email='info@domain.com',$linkText='Contact Us',$attrs ='class="emailencoder"' )
{
// remplazar aroba y puntos
$email = str_replace('@','@',$email);
$email = str_replace('.','.',$email);
$email = str_split($email,5); $linkText = str_replace('@',$linkText);
$linkText = str_replace('.',$linkText);
$linkText = str_split($linkText,5); $part1 = '<a href="ma';
$part2 = 'ilto:';
$part3 = '" '. $attrs .' >';
$part4 = ''; $encoded = '<script type="text/javascript">';
$encoded .= "document.write('$part1');";
$encoded .= "document.write('$part2');";
foreach($email as $e)
{
$encoded .= "document.write('$e');";
}
$encoded .= "document.write('$part3');";
foreach($linkText as $l)
{
$encoded .= "document.write('$l');";
}
$encoded .= "document.write('$part4');";
$encoded .= ''; return $encoded;
}
4. 验证邮件地址 电子邮件验证也许是中最常用的网页表单验证，此代码除了验证电子邮件地址，也可以选择检查邮件域所属 DNS 中的 MX 记录，使邮件验证功能更加强大。
<div class="codetitle"><a style="CURSOR: pointer" data="64701" class="copybut" id="copybut64701" onclick="doCopy('code64701')"> 代码如下:<div class="codebody" id="code64701">
function is_valid_email($email,$test_mx = false)
{
if(eregi("^([_a-z0-9-]+)(.[_a-z0-9-]+)@([a-z0-9-]+)(.[a-z0-9-]+)(.[a-z]{2,4})$",$email))
if($test_mx)
{
list($username,$domain) = split("@",$email);
return getmxrr($domain,$mxrecords);
}
else
return true;
else
return false;
}
5. 列出目录内容
<div class="codetitle"><a style="CURSOR: pointer" data="46138" class="copybut" id="copybut46138" onclick="doCopy('code46138')"> 代码如下:<div class="codebody" id="code46138">
function list_files($dir)
{
if(is_dir($dir))
{
if($handle = opendir($dir))
{
while(($file = readdir($handle)) !== false)
{
if($file != "." && $file != ".." && $file != "Thumbs.db")
{
echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'
'."n";
}
}
closedir($handle);
}
}
}
6. 销毁目录 删除一个目录，包括它的内容。
<div class="codetitle"><a style="CURSOR: pointer" data="28384" class="copybut" id="copybut28384" onclick="doCopy('code28384')"> 代码如下:<div class="codebody" id="code28384">
/
@dir - Directory to destroy
@virtual[optional]- whether a virtual directory
/
function destroyDir($dir,$virtual = false)
{
$ds = DIRECTORY_SEPARATOR;
$dir = $virtual ? realpath($dir) : $dir;
$dir = substr($dir,-1) == $ds ? substr($dir,-1) : $dir;
if (is_dir($dir) && $handle = opendir($dir))
{
while ($file = readdir($handle))
{
if ($file == '.' || $file == '..')
{
continue;
}
elseif (is_dir($dir.$ds.$file))
{
destroyDir($dir.$ds.$file);
}
else
{
unlink($dir.$ds.$file);
}
}
closedir($handle);
rmdir($dir);
return true;
}
else
{
return false;
}
}
7. 解析 JSON 数据 与大多数流行的 Web 服务如 Twitter 通过开放 API 来提供数据一样，它总是能够知道如何解析 API 数据的各种传送格式，包括 JSON，XML 等等。
<div class="codetitle"><a style="CURSOR: pointer" data="55088" class="copybut" id="copybut55088" onclick="doCopy('code55088')"> 代码如下:<div class="codebody" id="code55088">
$json_string='{"id":1,"name":"foo","email":"foo@foobar.com","interest":["wordpress","php"]} ';
$obj=json_decode($json_string);
echo $obj->name; //prints foo
echo $obj->interest[1]; //prints php
8. 解析 XML 数据
<div class="codetitle"><a style="CURSOR: pointer" data="74978" class="copybut" id="copybut74978" onclick="doCopy('code74978')"> 代码如下:<div class="codebody" id="code74978">
//xml string
$xml_string="<?xml version='1.0'?>
Foo
foo@bar.com
Foobar
foobar@foo.com
"; //load the xml string using simplexml
$xml = simplexml_load_string($xml_string); //loop through the each node of user
foreach ($xml->user as $user)
{
//access attribute
echo $user['id'],' ';
//subnodes are accessed by -> operator
echo $user->name,' ';
echo $user->email,'
';
}
9. 创建日志缩略名 创建用户友好的日志缩略名。
<div class="codetitle"><a style="CURSOR: pointer" data="41866" class="copybut" id="copybut41866" onclick="doCopy('code41866')"> 代码如下:<div class="codebody" id="code41866">
function create_slug($string){
$slug=preg_replace('/[^A-Za-z0-9-]+/','-',$string);
return $slug;
}
10. 获取客户端真实 IP 地址 该函数将获取用户的真实 IP 地址，即便他使用代理服务器。
<div class="codetitle"><a style="CURSOR: pointer" data="41202" class="copybut" id="copybut41202" onclick="doCopy('code41202')"> 代码如下:<div class="codebody" id="code41202">
function getRealIpAddr()
{
if (!emptyempty($_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 $ip;
}
11. 强制性文件下载 为用户提供强制性的文件下载功能。
<div class="codetitle"><a style="CURSOR: pointer" data="16635" class="copybut" id="copybut16635" onclick="doCopy('code16635')"> 代码如下:<div class="codebody" id="code16635">
/****
@file - path to file
/
function force_download($file)
{
if ((isset($file))&&(file_exists($file))) {
header("Content-length: ".filesize($file));
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="' . $file . '"');
readfile("$file");
} else {
echo "No file selected";
}
}
12. 创建标签云
<div class="codetitle"><a style="CURSOR: pointer" data="90336" class="copybut" id="copybut90336" onclick="doCopy('code90336')"> 代码如下:<div class="codebody" id="code90336">
function getCloud( $data = array(),$minFontSize = 12,$maxFontSize = 30 )
{
$minimumCount = min( array_values( $data ) );
$maximumCount = max( array_values( $data ) );
$spread = $maximumCount - $minimumCount;
$cloudHTML = '';
$cloudTags = array(); $spread == 0 && $spread = 1; foreach( $data as $tag => $count )
{
$size = $minFontSize + ( $count - $minimumCount )
* ( $maxFontSize - $minFontSize ) / $spread;
$cloudTags[] = '<a style="font-size: ' . floor( $size ) . 'px'
. '" href="#" title="'' . $tag .
'' returned a count of ' . $count . '">'
. htmlspecialchars( stripslashes( $tag ) ) . '';
} return join( "n",$cloudTags ) . "n";
}
/**
Sample usage */
$arr = Array('Actionscript' => 35,'Adobe' => 22,'Array' => 44,'Background' => 43,
'Blur' => 18,'Canvas' => 33,'Class' => 15,'Color Palette' => 11,'Crop' => 42,
'Delimiter' => 13,'Depth' => 34,'Design' => 8,'Encode' => 12,'Encryption' => 30,
'Extract' => 28,'Filters' => 42);
echo getCloud($arr,12,36);
13. 寻找两个字符串的相似性 PHP 提供了一个极少使用的 similar_text 函数，但此函数非常有用，用于比较两个字符串并返回相似程度的百分比。
<div class="codetitle"><a style="CURSOR: pointer" data="42675" class="copybut" id="copybut42675" onclick="doCopy('code42675')"> 代码如下:<div class="codebody" id="code42675">
similar_text($string1,$string2,$percent);
//$percent will have the percentage of similarity
14. 在应用程序中使用 Gravatar 通用头像 随着 WordPress 越来越普及，Gravatar 也随之流行。由于 Gravatar 提供了易于使用的 API，将其纳入应用程序也变得十分方便。
<div class="codetitle"><a style="CURSOR: pointer" data="85659" class="copybut" id="copybut85659" onclick="doCopy('code85659')"> 代码如下:<div class="codebody" id="code85659">
/****
@email - Email address to show gravatar for
@size - size of gravatar
@default - URL of default gravatar to use
@rating - rating of Gravatar(G,PG,R,X)
*/
function show_gravatar($email,$size,$default,$rating)
{
echo '<img src="http://www.gravatar.com/avatar.php?gravatar_id='.md5($email).
'&default='.$default.'&size='.$size.'&rating='.$rating.'" width="'.$size.'px"
height="'.$size.'px" />';
}
15. 在字符断点处截断文字 所谓断字 (word break)，即一个单词可在转行时断开的地方。这一函数将在断字处截断字符串。
<div class="codetitle"><a style="CURSOR: pointer" data="9822" class="copybut" id="copybut9822" onclick="doCopy('code9822')"> 代码如下:<div class="codebody" id="code9822">
// Original PHP code by Chirp Internet: www.chirp.com.au
// Please acknowledge use of this code by including this header.
function myTruncate($string,$limit,$break=".",$pad="...") {
// return with no change if string is shorter than $limit
if(strlen($string) <= $limit)
return $string; // is $break present between $limit and the end of the string?
if(false !== ($breakpoint = strpos($string,$break,$limit))) {
if($breakpoint < strlen($string) - 1) {
$string = substr($string,$breakpoint) . $pad;
}
}
return $string;
}
/* Example /
$short_string=myTruncate($long_string,100,' ');
16. 文件 Zip 压缩
<div class="codetitle"><a style="CURSOR: pointer" data="37334" class="copybut" id="copybut37334" onclick="doCopy('code37334')"> 代码如下:<div class="codebody" id="code37334">
/ creates a compressed zip file /
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;
}
}
/* Example Usage */
$files=array('file1.jpg','file2.jpg','file3.gif');
create_zip($files,'myzipfile.zip',true);
17. 解压缩 Zip 文件
<div class="codetitle"><a style="CURSOR: pointer" data="1681" class="copybut" id="copybut1681" onclick="doCopy('code1681')"> 代码如下:<div class="codebody" id="code1681">
/**
@file - path to zip file
@destination - destination directory for unzipped files
*/
function unzip_file($file,$destination){
// create object
$zip = new ZipArchive() ;
// open archive
if ($zip->open($file) !== TRUE) {
die ('Could not open archive');
}
// extract contents to destination directory
$zip->extractTo($destination);
// close archive
$zip->close();
echo 'Archive extracted to directory';
}
18. 为 URL 地址预设 http 字符串 有时需要接受一些表单中的网址输入，但用户很少添加 http:// 字段，此代码将为网址添加该字段。
<div class="codetitle"><a style="CURSOR: pointer" data="35198" class="copybut" id="copybut35198" onclick="doCopy('code35198')"> 代码如下:<div class="codebody" id="code35198">
if (!preg_match("/^(http|ftp):/",$_POST['url'])) {
$_POST['url'] = 'http://'.$_POST['url'];
}
19. 将网址字符串转换成超级链接 该函数将 URL 和 E-mail 地址字符串转换为可点击的超级链接。
<div class="codetitle"><a style="CURSOR: pointer" data="8090" class="copybut" id="copybut8090" onclick="doCopy('code8090')"> 代码如下:<div class="codebody" id="code8090">
function makeClickableLinks($text) {
$text = eregireplace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%+.~#?&//=]+)',
'<a href="1">1',$text);
$text = eregireplace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%+.~#?&//=]+)',
'1<a href="http://2">2',$text);
$text = eregireplace('([.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})',
'<a href="mailto:1">1',$text); return $text;
}
20. 调整图像尺寸 创建图像缩略图需要许多时间，此代码将有助于了解缩略图的逻辑。
<div class="codetitle"><a style="CURSOR: pointer" data="15971" class="copybut" id="copybut15971" onclick="doCopy('code15971')"> 代码如下:<div class="codebody" id="code15971">
/****
@filename - path to the image
@tmpname - temporary path to thumbnail
@xmax - max width
@ymax - max height
/
function resize_image($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($newy),$x,$y);
return $im2;
}
21. 检测 Ajax 请求 大多数的 JavaScript 框架如 jQuery，Mootools 等，在发出 Ajax 请求时，都会发送额外的 HTTP_X_REQUESTED_WITH 头部信息，头当他们一个ajax请求，因此你可以在服务器端侦测到 Ajax 请求。
<div class="codetitle"><a style="CURSOR: pointer" data="65769" class="copybut" id="copybut65769" onclick="doCopy('code65769')"> 代码如下:<div class="codebody" id="code65769">
if(!emptyempty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest'){
//If AJAX Request Then
}else{
//something else
}
（编辑：李大同）
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