PHP获取网卡地址的代码

<?php    
@exec("ipconfig /all",$array);    
for($tmpa;$tmpa<count($array);$tmpa++){    
    if(eregi("physical",$array[$tmpa])){    
        $getstr=explode(":",$array[$tmpa]);    
        echo $getstr[1];    
    }    
}    

?>