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@ 2018-04-15T15:00:44Z

<?php

$woord = 'appel';
$count = strlen($woord);
$array = ['l','b','p','s','p'];
for ($i = 0; $i < $count; $i++) {
    if (!in_array($woord[$i], $array)) $woord = str_replace($woord[$i], '_', $woord);
}
echo $woord;

Output
Performance
VLD
References
Branches

str_replace: documentation ( source)
in_array: documentation ( source)

preferences:dark modelive preview

25.43 ms | 405 KiB | 5 Q