PHP code to obtain network card address

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

?>