- print_r: documentation ( source)
- preg_replace: documentation ( source)
- str_split: documentation ( source)
<?php
$hash = '8234jfr98j4fnui4hfj3289rj8';
$numbers = preg_replace('/[a-z]/si', 'a', $hash);
$numbers = str_split($numbers);
foreach ($numbers as $key => $temp) {
if ($temp === 'a') unset($numbers[$key]);
}
print_r($numbers);