Online PHP editor | refs for hraLm

<?php $subusers = [" hey", " wh at", " ", "wh@t"]; foreach ($subusers as $subuser) { echo "Assess \"$subuser\":\t"; if (!strlen($subuser = trim($subuser))) { echo "* Username not entered"; //} elseif (!preg_match('/^[\da-z]+$/i', $subuser)) { } elseif (!ctype_alnum($subuser)) { echo "* Username not alphanumeric"; } echo "\n"; }