- array_map: documentation ( source)
- var_export: documentation ( source)
<?php
$matrix = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9],
];
var_export(array_map('array_reverse', array_map(null, ...$matrix)));
/* Desired:
[[7,4,1],
[8,5,2],
[9,6,3]]
*/