- var_dump: documentation ( source)
- str_replace: documentation ( source)
<?php
$id = '01110413';
$ltr = array('00' => 'A', '01' => 'B', '03' => 'C', '04' => 'D');
foreach ($ltr as $search=>$replace) {
$id = str_replace($search, $replace, $id);
}
var_dump($id);