3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = [1, 2, 3, 4, 5, 6, 7, 8, 9]; $result = []; while ($array) { $result[] = implode(', ', array_splice($array, 0, 4)); } var_export($result);
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 - 8.3.25, 8.4.1 - 8.4.12
array ( 0 => '1, 2, 3, 4', 1 => '5, 6, 7, 8', 2 => '9', )

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121.97 ms | 406 KiB | 5 Q