PHP获取网卡MAC地址

php    
/**    
获取网卡的MAC地址原码；目前支持WIN/LINUX系统    
获取机器网卡的物理（MAC）地址    
**/    
      
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;    
         }    
       
}    
//方法使用    
//$mac = new GetMacAddr(PHP_OS);    
//echo $mac->mac_addr;    
?>