10个超级有用、必须收藏的PHP代码样例_php

　　作为一个正常的程序员，会好几种语言是十分正常的，相信大部分程序员也都会编写几句php程序，如果是web程序员，PHP一定是必备的，即使你没用它开发过大型软件项目，也一定多少了解它的语法。

　　尽管PHP经常被人诟病，被人贬低，被人当玩笑开，事实证明，PHP是全世界网站开发中使用率最高的编程语言。PHP最大的缺点是太简单，语法不严谨，框架体系很弱，但这也是它最大的优点，一个有点编程背景的普通人，只需要学习PHP半天时间，就可以上手开始开发web应用了。

　　网上有人总结几种编程语言的特点，我觉得也挺有道理的：

PHP 就是： Quick and Dirty
java 就是： Beauty and Slowly
Ruby 就是： Quick and Beauty
python 就是： Quick and Simple

　　在PHP的流行普及中，网上总结出了很多实用的PHP代码片段，这些代码片段在当你遇到类似的问题时，粘贴过去就可以使用，非常的高效，非常的省时省力。将这些程序员前辈总结出的优秀代码放到自己的知识库中，是一个善于学习的程序员的好习惯。

　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[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

 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、从网络下载文件

 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、Alexa/Google Page Rank

 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');

　五、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) > 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;  }

　六、通过Email显示用户的Gravatar头像

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

　七、通过cURL获取RSS订阅数

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

　八、时间差异计算函数

 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' "; }

　九、裁剪图片

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

　十、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, 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";

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