3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = '1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,28,29,30,31,32,33,34,35,36,37,38,39,41,45,47,71,73,75,76,77,78,80,81,83,87,88,89,90'; $list = explode(',', $str); $list_new = $list + array('91'); var_export($list_new);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 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 => '1', 1 => '2', 2 => '3', 3 => '4', 4 => '5', 5 => '6', 6 => '7', 7 => '8', 8 => '9', 9 => '10', 10 => '11', 11 => '12', 12 => '13', 13 => '14', 14 => '15', 15 => '16', 16 => '17', 17 => '28', 18 => '29', 19 => '30', 20 => '31', 21 => '32', 22 => '33', 23 => '34', 24 => '35', 25 => '36', 26 => '37', 27 => '38', 28 => '39', 29 => '41', 30 => '45', 31 => '47', 32 => '71', 33 => '73', 34 => '75', 35 => '76', 36 => '77', 37 => '78', 38 => '80', 39 => '81', 40 => '83', 41 => '87', 42 => '88', 43 => '89', 44 => '90', )

preferences:
230.62 ms | 407 KiB | 456 Q