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<?php declare(strict_types = 1); function doFoobarNull(string $s): void { if (preg_match_all('/(foo)?(bar)?(baz)?/', $s, $matches, PREG_OFFSET_CAPTURE)) { var_dump($matches); } } doFoobarNull("baz");
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array(4) { [0]=> array(2) { [0]=> array(2) { [0]=> string(3) "baz" [1]=> int(0) } [1]=> array(2) { [0]=> string(0) "" [1]=> int(3) } } [1]=> array(2) { [0]=> array(2) { [0]=> string(0) "" [1]=> int(-1) } [1]=> array(2) { [0]=> string(0) "" [1]=> int(-1) } } [2]=> array(2) { [0]=> array(2) { [0]=> string(0) "" [1]=> int(-1) } [1]=> array(2) { [0]=> string(0) "" [1]=> int(-1) } } [3]=> array(2) { [0]=> array(2) { [0]=> string(3) "baz" [1]=> int(0) } [1]=> array(2) { [0]=> string(0) "" [1]=> int(-1) } } }

preferences:
51.52 ms | 408 KiB | 5 Q