contoh kondisi in_array

<?php
$input = 'MTAwMDA=';
$ar = array('MTAwMDA=', 'MTUwMDA=', 'MjAwMDA=', 'MjUwMDA=', 'MzAwMDA=', 'NTAwMDA=', 'NjAwMDA=', 'NzUwMDA=', 'MTAwMDAw=', 'MTUwMDAw=', 'MTc1MDAw=', 'MjAwMDAw=', 'MjUwMDAw=', 'MzAwMDAw=', 'MzUwMDAw=', 'NDAwMDAw=', 'NDUwMDAw=', 'NTAwMDAw=');
if (!in_array($input, $ar)) {
    echo $input.' not found';
}