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<?php preg_match('/b(?<a>a)?/', 'xxxxbxxxx', $matches); var_dump($matches); var_dump(array_has_key('a', $matches));
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> string(1) "b" } Fatal error: Uncaught Error: Call to undefined function array_has_key() in /in/dUqf4:7 Stack trace: #0 {main} thrown in /in/dUqf4 on line 7
Process exited with code 255.

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