- str_replace: documentation ( source)
- error_reporting: documentation ( source)
- explode: documentation ( source)
- array_unique: documentation ( source)
<?php
error_reporting(0);
$a = "abcdefffefa";
$b = "afe";
print(array_unique(explode('', $b)));
print(str_replace(array_unique(explode('', $b)), "", $a));