3v4l.org

run code in 300+ PHP versions simultaneously
<?php $matrix = [ [1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12], ]; var_export( array_map( null, ...array_chunk( array_merge(...$matrix), count($matrix) ) ) );
Output for 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 - 8.3.25, 8.4.1 - 8.4.12
array ( 0 => array ( 0 => 1, 1 => 5, 2 => 9, ), 1 => array ( 0 => 2, 1 => 6, 2 => 10, ), 2 => array ( 0 => 3, 1 => 7, 2 => 11, ), 3 => array ( 0 => 4, 1 => 8, 2 => 12, ), )
preferences:
139.63 ms | 407 KiB | 5 Q