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<?php var_dump(preg_match_all('//', 'abcd', $m), $m);
Output for 4.3.0 - 7.1.0
int(5) array(1) { [0]=> array(5) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" [3]=> string(0) "" [4]=> string(0) "" } }