<?php function callback($s) { var_dump($s); return substr_replace($s[0], str_repeat('*', strlen($s[0])), 0, -4); } $values = array( '65746244234383238', '5746244234383238', '746244234383238', '46244234383238', '6244234383238', '244234383238', '44234383238', ); foreach ($values as $value) var_dump(preg_replace_callback('/\d{12,16}/', 'callback', $value));
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