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贡献PHP获取网卡的MAC地址

潜水很久，贡献PHP获取网卡的MAC地址原码；目前支持WIN / LINUX系统；至于AIX等，各位大虾有和高见！
<? php
/* *
        获取机器网卡的物理（MAC）地址 
        wwa  $Exp 
* */
class  GetMacAddr
{
         var   $return_array   =   array ();  //  返回带有MAC地址的字串数组
         var   $mac_addr ;
        
         function  GetMacAddr( $os_type )
        {
                 switch  (  strtolower ( $os_type ) )
                {
                         case   " linux " :
                                 $this -> forLinux();
                                 break ;
                         case   " solaris " :
                                 break ;
                         case   " unix " :
                                 break ;
                         case   " aix " :
                                 break ;
                         default :
                                 $this -> forWindows();
                                 break ;
                }
                
                 $temp_array   =   array ();
                 foreach  (  $this -> return_array  as   $value  )
                {
                         if  (  preg_match (  " /[0-9a-f][0-9a-f][:-] " . " [0-9a-f][0-9a-f][:-] " . " [0-9a-f][0-9a-f][:-] " . " [0-9a-f][0-9a-f][:-] " . " [0-9a-f][0-9a-f][:-] " . " [0-9a-f][0-9a-f]/i " ,   $value ,   $temp_array  ) )
                        {
                                 $this -> mac_addr  =   $temp_array [ 0 ];
                                 break ;
                        }
                }
                 unset ( $temp_array );
                 return   $this -> mac_addr;
        }

         function  forWindows()
        {
                @ exec ( " ipconfig /all " ,   $this -> return_array);
                 if  (  $this -> return_array )
                         return   $this -> return_array;
                 else {
                         $ipconfig   =   $_SERVER [ " WINDIR " ] . " \system32\ipconfig.exe " ;
                         if  (  is_file ( $ipconfig ) )
                                @ exec ( $ipconfig . "  /all " ,   $this -> return_array);
                         else
                                @ exec ( $_SERVER [ " WINDIR " ] . " \system\ipconfig.exe /all " ,   $this -> return_array);
                         return   $this -> return_array;
                }
        }

         function  forLinux()
        {
                @ exec ( " ifconfig -a " ,   $this -> return_array);
                 return   $this -> return_array;
        }
}
?>
<?
// $mac = new GetMacAddr(PHP_OS);
//echo $mac->mac_addr;
?>