<?php
$string = $_GET['ankety'];
$string = substr(preg_replace( '/\D/', '', $string), -4);
$cislo = (int) $string;
$cislo = $cislo + 1;
echo $cislo;
?>
<?php
$string = $_GET['ankety'];
$string = substr(preg_replace( '/\D/', '', $string), -4);
$cislo = (int) $string;
$cislo = $cislo + 1;
echo $cislo;
?>