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<?php $test = '1'; var_dump(is_int($test)); var_dump(!!filter_var($test, FILTER_VALIDATE_INT));
Output for 7.1.25 - 7.1.28, 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 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
bool(false) bool(true)
preferences:
135.68 ms | 403 KiB | 162 Q