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<?php preg_match('/hello/','i says hello to you',$matches); print_r($matches); ?>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.32, 7.1.0 - 7.1.33, 7.2.0 - 7.2.31, 7.3.0 - 7.3.19, 7.4.0 - 7.4.8, 8.0.0alpha1 - alpha2
Array ( [0] => hello )