How to Naturally Sort Multidimensional Arrays with PHP

Here’s a Multidimensional Array:

$data = [
  [
    'id' => 1794,
    'size' => 1,
    'color' => 'Red',
  ],
  [
    'id' => 1826,
    'size' => '2XL',
    'color' => 'Red',
  ],
  [
    'id' => 1827,
    'size' => 3,
    'color' => '',
  ],
  [
    'id' => 1825,
    'size' => 30,
    'color' => 'Black'
  ],
  [
    'id' => 1828,
    'size' => '3XL',
    'color' => 'Blue'
  ],
  [
    'id' => 1829,
    'size' => 'Medium',
'color' => 'Blue'
  ],
  [
    'id' => 1795,
    'size' => 'XS',
    'color' => 'Red'
  ]
];

The above array can be sorted in natural order by using the following code:

usort($data, function($a, $b) {
    return strnatcasecmp($a['size'], $b['size']);
});

//Print output
echo "<pre>";
print_r($aa);

strnatcasecmp() function used in the above code compares two strings using a “natural” algorithm. It returns the result based on input arguments, where the first argument specifies the first string to compare, and the second argument specifies the second string to compare.

Executing the above code will produce the following output:

Array
(
    [0] => Array
        (
            [id] => 1794
            [size] => 1
            [color] => Red
        )

    [1] => Array
        (
            [id] => 1826
            [size] => 2XL
            [color] => Red
        )

    [2] => Array
        (
            [id] => 1827
            [size] => 3
            [color] => 
        )

    [3] => Array
        (
            [id] => 1828
            [size] => 3XL
            [color] => Blue
        )

    [4] => Array
        (
            [id] => 1825
            [size] => 30
            [color] => Black
        )

    [5] => Array
        (
            [id] => 1829
            [size] => Medium
            [color] => Blue
        )

    [6] => Array
        (
            [id] => 1795
            [size] => XS
            [color] => Red
        )
)