3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = '[1,[01,11,12] ,4 ,5, [20,21,22]]'; $parts = preg_split('/,(?![^\[]*\])/', $string, -1, PREG_SPLIT_DELIM_CAPTURE); $output = array(); foreach ($parts as $part) { $part = trim($part, '[] '); $output[] = explode(',', $part); } print_r($output);
Output for 7.1.25 - 7.1.32, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.14
Array ( [0] => Array ( [0] => 1 ) [1] => Array ( [0] => 01 [1] => 11 [2] => 12 ) [2] => Array ( [0] => 4 ) [3] => Array ( [0] => 5 ) [4] => Array ( [0] => 20 [1] => 21 [2] => 22 ) )
preferences:
168.56 ms | 408 KiB | 5 Q