6个超实用的PHP代码片段
2024-09-28 18:16:42
一、黑名单过滤 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[] as $match){
if(!in_array($match, $temp)){
$temp[$match] = $temp[$match] + ;
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:
dog:
cat:
monkey:
二、随机颜色生成器 function randomColor() {
$str = '#';
for($i = ; $i < ; $i++) {
$randNum = rand( , );
switch ($randNum) {
case : $randNum = 'A'; break;
case : $randNum = 'B'; break;
case : $randNum = 'C'; break;
case : $randNum = 'D'; break;
case : $randNum = 'E'; break;
case : $randNum = 'F'; break;
}
$str .= $randNum;
}
return $str;
}
$color = randomColor();
三、从网上下载文件 set_time_limit();
// 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, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, 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);
四、强制下载文件 $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) > ){
$row = mysql_fetch_array($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();
}else{
header("Location: /");
exit;
}
五、截取图片 $filename= "test.jpg";
list($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, , , );
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($dst_im);
六、检查网站是否宕机 function Visit($url){
$agent = "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)";$ch=curl_init();
curl_setopt ($ch, CURLOPT_URL,$url );
curl_setopt($ch, CURLOPT_USERAGENT, $agent);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, );
curl_setopt ($ch,CURLOPT_VERBOSE,false);
curl_setopt($ch, CURLOPT_TIMEOUT, );
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch,CURLOPT_SSLVERSION,);
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>= && $httpcode<) return true;
else return false;
}
if (Visit("http://www.google.com"))
echo "Website OK"."n";
else
echo "Website DOWN";
这篇文章主要介绍了10个超实用的PHP代码样例:黑名单过滤、随机颜色生成器、从网上下载文件、强制下载文件、截取图片、检查网站是否宕机,需要的朋友可以参考下
一、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' ; ab:3 dog:3 cat:2 monkey:2 |
二、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(); |
三、从网上下载文件
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set_time_limit(0); // Supports all file types // URL Here: $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, true); curl_setopt( $ch , CURLOPT_FOLLOWLOCATION, true); curl_setopt( $ch , 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( $handle ); |
四、强制下载文件
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$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( $row [ 'FileName' ]); exit (0); } else { header( "Location: /" ); exit ; } |
五、截取图片
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$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, 255, 255); imagefill( $dst_im , 0, 0, $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 ); |
六、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 , CURLOPT_URL, $url ); curl_setopt( $ch , CURLOPT_USERAGENT, $agent ); curl_setopt ( $ch , CURLOPT_RETURNTRANSFER, 1); curl_setopt ( $ch ,CURLOPT_VERBOSE,false); curl_setopt( $ch , 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; } echo "Website OK" . "n" ; else echo "Website DOWN" ; |
以上就是6个超实用的PHP代码样例,希望对大家学习PHP编程有所帮助,果断收藏吧
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