Filling Multidimensional Arrays in PHP

Suppose now we want to create some multidimensional array with numbers in a loop.

For example, the following two-dimensional array:

<?php
	[[1, 2, 3], [1, 2, 3], [1, 2, 3]]
?>

Let's solve the task by using two nested loops. The outer loop will create subarrays, and the inner one will fill these subarrays with numbers:

<?php
	$arr = [];
	
	for ($i = 0; $i < 3; $i++) {
		for ($j = 0; $j < 3; $j++) {
			$arr[$i][$j] = $j + 1; // filling the subarray with numbers
		}
	}
	
	var_dump($arr);
?>

Form the following array using two nested loops:

[[1, 2, 3, 4, 5], [1, 2, 3, 4, 5], [1, 2, 3, 4, 5]]

Form the following array using two nested loops:

[['x', 'x', 'x', 'x'], ['x', 'x', 'x', 'x'], ['x', 'x', 'x', 'x']]

Form the following array using three nested loops:

[
	[
		[1, 2, 3, 4, 5],
		[1, 2, 3, 4, 5],
	],
	[
		[1, 2, 3, 4, 5],
		[1, 2, 3, 4, 5],
	],
	[
		[1, 2, 3, 4, 5],
		[1, 2, 3, 4, 5],
	],
]