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<?php function group_nums($array) { $ret = array(); $temp = array(); foreach($array as $val) { if(next($array) == ($val + 1)) $temp[] = $val; else if(count($temp) > 0) { $temp[] = $val; $ret[] = $temp[0].'-'.end($temp); $temp = array(); } else $ret[] = $val; } return $ret; } $a = [2,3,4,7,8,9,10,11,13,15]; print_r(group_nums($a));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 2-4 [1] => 7-11 [2] => 13 [3] => 15 )

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