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<?php var_dump(preg_match('/^/', 'foo', $m)); var_dump($m); var_dump(preg_match('/\s*/', 'foo', $m)); var_dump($m); var_dump(preg_match('/\w+/', 'foo', $m)); var_dump($m); var_dump(preg_match('/$/', 'foo', $m)); var_dump($m);
Output for 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.14
int(1) array(1) { [0]=> string(0) "" } int(1) array(1) { [0]=> string(0) "" } int(1) array(1) { [0]=> string(3) "foo" } int(1) array(1) { [0]=> string(0) "" }
preferences:
171.48 ms | 408 KiB | 5 Q