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<?php var_dump( preg_match_all('/\/social\/add-activity\/(\w+)\/(\d+)/', '/social/add-activity/history', $matches), $matches );
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(0) array(3) { [0]=> array(0) { } [1]=> array(0) { } [2]=> array(0) { } }