Online PHP editor | refs for r1bnL

<?php function group($cond, $arr) { if (!$arr) return []; $e = array_shift($arr); $g = [$e]; while($cond($e, reset($arr))) { $g[] = array_shift($arr); } return array_merge([$g], group($cond, $arr)); } function it($m,$p){echo ($p?'OK':'NO')." It $m\n";}; echo it ('groups', group(it, [1,5,5,6,6,6,7,9]) == [[1],[5,5],[6,6,6],[7],[9]]);