Online PHP editor | refs for 7fHRM

<?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 $m\n";} function eq($a,$b) {return $a==$b;} //echo it ('groups', group('eq', [1,5,5,6,6,6,7,9]) == [[1],[5,5],[6,6,6],[7],[9]]); it('spans elements which match', group(function ($x) { return $x < 3; }, [1, 2, 3]) === [[1, 2], [3]]); it('spans elements which match from the start', group(function ($x) { return $x == 3; }, [1, 6, 3, 3]) === [[], [1, 2, 3, 3]]); it('spans returns empty lists on empty list', group(function ($x) { return false; }, []) === [[], []]); it('groups elements recursively', array_group(function ($a, $b) { return $a === $b; }, [1, 1, 2, 1]) === [[1, 1], [2], [1]]);