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<?php $allowed = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; $input = 'abc-def'; $validLen = strspn($input, $allowed); if (strlen($input) !== $validLen) { printf('Input invalid, starting at %s', substr($input, $validLen)); } else { echo 'Input is valid'; }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Input invalid, starting at -def
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101.96 ms | 1556 KiB | 4 Q