PHP系統命令函數使用分析

本篇文章是對PHP中系統命令函數的使用進行了詳細的分析介紹需要的朋友參考下   復制代碼 代碼如下:

　　
function execute($cmd) {
     $res = ;
     if ($cmd) {
         if(function_exists(system)) {
             @ob_start();
             @system($cmd);
             $res = @ob_get_contents();
             @ob_end_clean();
         } elseif(function_exists(passthru)) {
             @ob_start();
             @passthru($cmd);
             $res = @ob_get_contents();
             @ob_end_clean();
         } elseif(function_exists(shell_exec)) {
             $res = @shell_exec($cmd);
         } elseif(function_exists(exec)) {
             @exec($cmd$res);
             $res = join(“n"$res);
         } elseif(@is_resource($f = @popen($cmd"r"))) {
             $res = ;
             while(!@feof($f)) {
                 $res = @fread($f);
             }
             @pclose($f);
         }
     }
     return $res;
 }

From:http://tw.wingwit.com/Article/program/PHP/201311/20961.html