3v4l.org

run code in 300+ PHP versions simultaneously

sponsor
bughunt
search
recent
about

@ 2018-10-06T22:45:18Z

<?php
$subusers = [" hey", " h i", " ", "wh@t"];
foreach ($subusers as $subuser) {
    echo "Assess \"$subuser\":\t";
    if (!strlen($subuser = trim($subuser))) {
        echo "* Username not entered";
    } elseif (!ctype_alnum($subuser)) {
        echo "* Username not alphanumeric";
    }
    echo "\n";
}

Output
Performance
VLD
References
Branches

ctype_alnum: documentation ( source)
trim: documentation ( source)

preferences:dark modelive preview

56.78 ms | 402 KiB | 5 Q