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<?php $t = "ss [STOP] dfdf [STOP]"; preg_match_all('|\[STOP\]|U',$t, $stoplinks); var_dump($stoplinks);
Output for 5.3.23 - 7.3.0beta1
array(1) { [0]=> array(2) { [0]=> string(6) "[STOP]" [1]=> string(6) "[STOP]" } }