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@ 2015-09-05T12:47:25Z

<?php
$input = 'a';
if (ctype_alnum($input)) {
    echo 'oke';
} else {
    echo 'niet oke of leeg';
}

Output
Performance
VLD
References
Branches

ctype_alnum: documentation ( source)

preferences:dark modelive preview

62.65 ms | 402 KiB | 5 Q