6个超实用的PHP代码片段

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"; 

6个超实用的PHP代码片段

作者：淡忘~浅思 字体：[增加 减小] 类型：转载 时间：2015-08-10我要评论

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: $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

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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; } if (Visit("http://www.google.com")) 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