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<?php preg_replace_callback( '#a#', function($matches) { var_dump($matches); }, 'aa' ); preg_replace_callback( '#(?<hello>a)#', function($matches) { var_dump($matches); }, 'aa' );
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> string(1) "a" } array(1) { [0]=> string(1) "a" } array(3) { [0]=> string(1) "a" ["hello"]=> string(1) "a" [1]=> string(1) "a" } array(3) { [0]=> string(1) "a" ["hello"]=> string(1) "a" [1]=> string(1) "a" }

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