php获取window客户端物理IP地址信息

<?php
$info=system("ipconfig /all");
$contents=ob_get_clean();
$contents=iconv(‘GBK‘, ‘UTF-8‘, $contents);
$contents=explode("\r\n",$contents);
foreach($contents as $k=>$v)
{
    $v=trim($v);
    if(strpos($v,"物理地址")!==false)
    {
        $v=explode(":",$v);
        echo "物理IP地址是 ".$v[1];
        break;
    }
    
}
?>