- array_map: documentation ( source)
- var_export: documentation ( source)
- str_replace: documentation ( source)
<?php
$a1 = ['hello ? world', 'replace me ?'];
$a2 = [123, 456];
echo var_export(array_map(function ($a, $b) { return str_replace('?', $b, $a); }, $a1, $a2));