PHP开发中常用的十个代码样例

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‘; 
ab:3 
dog:3 
cat:2 
monkey:2 

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(); 

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,CURLOPT_URL,$url); 
curl_setopt($ch,CURLOPT_HEADER,false); 
curl_setopt($ch,CURLOPT_BINARYTRANSFER,true); 
curl_setopt($ch,CURLOPT_AUTOREFERER,CURLOPT_FOLLOWLOCATION,CURLOPT_RETURNTRANSFER,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);

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‘); 

$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; 
}

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

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

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‘ "; 
}

$filename= "test.jpg"; 
list($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,255,255); 
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); 

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,CURLOPT_TIMEOUT,5); 
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE); 
curl_setopt($ch,CURLOPT_SSLVERSION,3); 
curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,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";