3v4l.org

run code in 300+ PHP versions simultaneously
<?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 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.31, 7.1.0 - 7.1.23, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [0] => 2-4 [1] => 7-11 [2] => 13 [3] => 15 )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/15V3M on line 19
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/15V3M on line 19
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/15V3M on line 19
Process exited with code 255.
preferences:
209.36 ms | 401 KiB | 415 Q