3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = [1, 2, 3, 4, 5, 6, 7, 8, 9]; var_export( array_map( fn($v) => implode(', ', $v), array_chunk($array, 4) ) );
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
array ( 0 => '1, 2, 3, 4', 1 => '5, 6, 7, 8', 2 => '9', )
preferences:
106.5 ms | 406 KiB | 5 Q