<?php $arr1 = [['a' => 1, 'b' => 2], ['a' => 3, 'b' => 4], ['a' => 5, 'b' => 6]];
Standard input is empty
array(4) { ["c"]=> string(1) "d" [0]=> array(2) { ["a"]=> int(1) ["b"]=> int(2) } [1]=> array(2) { ["a"]=> int(3) ["b"]=> int(4) } [2]=> array(2) { ["a"]=> int(5) ["b"]=> int(6) } }