- var_dump: documentation ( source)
- asort: documentation ( source)
- array_keys: documentation ( source)
- array_pop: documentation ( source)
<?php
$arr = [0 => 23, 1 => 1, 2 => 22];
asort($arr);
$redirect = array_pop($arr);
var_dump(array_pop($arr));
var_dump(array_keys($redirect));