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<?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 for git.master, git.master_jit, rfc.property-hooks
_pp_l

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