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<?php $id = filter_var(new stdClass, FILTER_VALIDATE_INT, [ 'flags' => FILTER_NULL_ON_FAILURE ]); var_dump($id);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
NULL
Output for 5.6.0 - 5.6.25
bool(false)
preferences:
329.6 ms | 407 KiB | 5 Q