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<?php $str = "The cat sat on the roof of their house."; $matches = preg_split("/(the)/i", $str, -1,PREG_SPLIT_DELIM_CAPTURE); print_r($matches); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => [1] => The [2] => cat sat on [3] => the [4] => roof of [5] => the [6] => ir house. )