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<?php var_dump(!empty($o) && !preg_match('/(\d)\1{6,}/u', 10000000, $m)); var_dump(preg_match('/(\d)\1{6,}/u', 10000000, $m)); var_dump($m);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(false) int(1) array(2) { [0]=> string(7) "0000000" [1]=> string(1) "0" }