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php开发里实用的PHP代码片段

发布时间:2022-01-22 08:41:21 所属栏目:PHP教程 来源:互联网
导读:1.关键词高亮,代码如下: function highlight($sString, $aWords) { if (!is_array ($aWords) || emptyempty ($aWords) || !is_string ($sString)) { return false; } $sWords = implode (|, $aWords); return preg_replace (@b(.$sWords.)b@si, $1, $sStri
  1.关键词高亮,代码如下:
 
  function highlight($sString, $aWords) {
   if (!is_array ($aWords) || emptyempty ($aWords) || !is_string ($sString)) {
    return false;
   }
  
   $sWords = implode ('|', $aWords);
    return preg_replace ('@b('.$sWords.')b@si', '$1', $sString);
  }
  2.获取你的Feedburner的用户,代码如下:
 
  function get_average_readers($feed_id,$interval = 7){
   $today = date('Y-m-d', strtotime("now"));
   $ago = date('Y-m-d', strtotime("-".$interval." days"));
   $feed_url="https://feedburner.google.com/api/awareness/1.0/GetFeedData?uri=".$feed_id."&dates=".$ago.",".$today;
   $ch = curl_init();
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
   curl_setopt($ch, CURLOPT_URL, $feed_url);
   $data = curl_exec($ch);
   curl_close($ch);
   $xml = new SimpleXMLElement($data);
   $fb = $xml->feed->entry['circulation'];
  
   $nb = 0;
   foreach($xml->feed->children() as $circ){
    $nb += $circ['circulation'];
   }
  
   return round($nb/$interval);
  }
  3.自动生成密码,代码如下:
 
  function generatePassword($length=9, $strength=0) {
   $vowels = 'aeuy';
   $consonants = 'bdghjmnpqrstvz';
   if ($strength >= 1) {
    $consonants .= 'BDGHJLMNPQRSTVWXZ';
   }
   if ($strength >= 2) {
    $vowels .= "AEUY";
   }
   if ($strength >= 4) {
    $consonants .= '23456789';
   }
   if ($strength >= 8 ) {
    $vowels .= '@#$%';
   }
  
   $password = '';
   $alt = time() % 2;
   for ($i = 0; $i < $length; $i++) {
    if ($alt == 1) {
     $password .= $consonants[(rand() % strlen($consonants))];
     $alt = 0;
    } else {
     $password .= $vowels[(rand() % strlen($vowels))];
     $alt = 1;
    }
   }
   return $password;
  }
  4.压缩多个CSS文件,代码如下:
 
  header('Content-type: text/css');
  ob_start("compress");
  function compress($buffer) {
    /* remove comments */
    $buffer = preg_replace('!/*[^*]**+([^/][^*]**+)*/!', '', $buffer);
    /* remove tabs, spaces, newlines, etc. */
    $buffer = str_replace(array("rn", "r", "n", "t", '  ', '    ', '    '), '', $buffer);
    return $buffer;
  }
  
  /* your css files */
  include('master.css');
  include('typography.css');
  include('grid.css');
  include('print.css');
  include('handheld.css');
  
  ob_end_flush();
  5.获取短网址,代码如下:
 
  function getTinyUrl($url) {
      return file_get_contents("http://tinyurl.com/api-create.php?url=".$url);
  }  
  6.根据生日计算年龄,代码如下:
 
  function age($date){
   $year_diff = '';
   $time = strtotime($date);
   if(FALSE === $time){
    return '';
   }
  
   $date = date('Y-m-d', $time);
   list($year,$month,$day) = explode("-",$date);
   $year_diff = date("Y") – $year;
   $month_diff = date("m") – $month;
   $day_diff = date("d") – $day;
   if ($day_diff < 0 || $month_diff < 0) $year_diff–;
  
   return $year_diff;
  }
  7.计算执行时间,代码如下:
 
  //Create a variable for start time
  $time_start = microtime(true);
  
  // Place your PHP/HTML/JavaScript/CSS/Etc. Here
  
  //Create a variable for end time
  $time_end = microtime(true);
  //Subtract the two times to get seconds
  $time = $time_end - $time_start;
  
  echo 'Script took '.$time.' seconds to execute';8.PHP的维护模式
  function maintenance($mode = FALSE){
      if($mode){
  
          if(basename($_SERVER['SCRIPT_FILENAME']) != 'maintenance.php'){
              header("Location: http://example.com/maintenance.php");
              exit;
          }
      }else{
          if(basename($_SERVER['SCRIPT_FILENAME']) == 'maintenance.php'){
              header("Location: http://example.com/");
              exit;
          }
      }
  }
  通过IP判断来源,这是一个非常实用的代码片段,可以帮助你通过IP来判断访客来源,下面的方法通过接收一个参数,然后返回IP所在地点,如果没有找到,则返回UNKNOWN,代码如下:
 
  function detect_city($ip) {  
     
          $default = 'UNKNOWN';  
     
          if (!is_string($ip) || strlen($ip) < 1 || $ip == '127.0.0.1' || $ip == 'localhost')  
              $ip = '8.8.8.8';  
     
          $curlopt_useragent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)';  
     
          $url = 'http://ipinfodb.com/ip_locator.php?ip=' . urlencode($ip);  
          $ch = curl_init();  
     
          $curl_opt = array(  
              CURLOPT_FOLLOWLOCATION  => 1,  
              CURLOPT_HEADER      => 0,  
              CURLOPT_RETURNTRANSFER  => 1,  
              CURLOPT_USERAGENT   => $curlopt_useragent,  
              CURLOPT_URL       => $url,  
              CURLOPT_TIMEOUT         => 1,  
              CURLOPT_REFERER         => 'http://' . $_SERVER['HTTP_HOST'],  
          );  
     
          curl_setopt_array($ch, $curl_opt);  
     
          $content = curl_exec($ch);  
     
          if (!is_null($curl_info)) {  
              $curl_info = curl_getinfo($ch);  
          }  
     
          curl_close($ch);  
     
          if ( preg_match('{
  City : ([^<]*)
  }i', $content, $regs) )  {  
              $city = $regs[1];  
          }  
          if ( preg_match('{
  State/Province : ([^<]*)
  }i', $content, $regs) )  {  
              $state = $regs[1];  
          }  
     
          if( $city!='' && $state!='' ){  
            $location = $city . ', ' . $state;  
            return $location;  
          }else{  
            return $default;  
          }  
     
      }  
  判断一张图片的主色调,下面这个代码非常实用,能帮助你判断一张图片中的主色调,你可以分析任何图片,代码如下:
 
  $i = imagecreatefromjpeg("image.jpg");  
     
  for ($x=0;$x$i);$x++) {  
      for ($y=0;$y$i);$y++) {  
          $rgb = imagecolorat($i,$x,$y);  
          $r   = ($rgb >> 16) & 0xFF;  
          $g   = ($rgb >>  & 0xFF;  
          $b   = $rgb & 0xFF;  
     
          $rTotal += $r;  
          $gTotal += $g;  
          $bTotal += $b;  
          $total++;  
      }  
  }  
     
  $rAverage = round($rTotal/$total);  
  $gAverage = round($gTotal/$total);  
  $bAverage = round($bTotal/$total);
  不显示PHP错误而发送电子邮件取代之,如果你不想在页面中显示PHP错误,也可以通过email来获取错误信息,下面的代码可以帮助你实现.
 
  // Our custom error handler  
  function nettuts_error_handler($number, $message, $file, $line, $vars){  
      $email = "  
          
  An error ($number) occurred on line  
 
          $line and in the file: $file.  
          
   $message
 
  ";  
     
      $email .= "
  " . print_r($vars, 1) . "
  ";  
     
      $headers = 'Content-type: text/html; charset=iso-8859-1' . "rn";  
     
      // Email the error to someone...  
      error_log($email, 1, 'you@youremail.com', $headers);  
     
      // Make sure that you decide how to respond to errors (on the user's side)  
      // Either echo an error message, or kill the entire project. Up to you...  
      // The code below ensures that we only "die" if the error was more than  
      // just a NOTICE.  
      if ( ($number !== E_NOTICE) && ($number < 2048) ) {  
          die("There was an error. Please try again later.");  
      }  
  }  
     
  // We should use our custom function to handle errors.  
  set_error_handler('nettuts_error_handler');  
     
  // Trigger an error... (var doesn't exist)  
  echo $somevarthatdoesnotexist;  

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