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<?php $digits = '1234567890'; $alnum = '123test'; var_dump(preg_match('/^\d+$/D', $digits)); var_dump(preg_match('/^\d+$/D', $alnum)); var_dump(strspn($digits, $digits) === strlen($digits)); var_dump(strspn($alnum, $digits) === strlen($alnum)); var_dump((int)$digits == $digits); var_dump((int)$alnum == $alnum);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
int(1) int(0) bool(true) bool(false) bool(true) bool(false)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.29 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
int(1) int(0) bool(true) bool(false) bool(true) bool(true)

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