<?php
$string = "siteadi.com/al.php?getir=5415975631425794&kid=ey.5754575457&ok =2&all";
$bolum1 = explode("?", $string);
$bolum2 = explode("&", $bolum1[1]);
$bolum3 = explode("=", $bolum2[0]);
echo $bolum3[1];
?>