<?php $a = [1, 2, 3]; $b = ['a', 'b', 'c'];
Standard input is empty
Array
(
[0] => Array
(
[0] => 1
[1] => a
)
[1] => Array
(
[0] => 2
[1] => b
)
[2] => Array
(
[0] => 3
[1] => c
)
)