How to sort multidimensional array in PHP

Sort multidimensional array in PHP

<?php

// Example multidimensional array

$data = array(

    array(

        "id" => 1,

        "name" => "John",

        "age" => 25

    ),

    array(

        "id" => 2,

        "name" => "Mike",

        "age" => 30

    ),

    array(

        "id" => 3,

        "name" => "Tina",

        "age" => 23

    )

);

// Sort the array by the "age" key

usort($data, function($a, $b) {

    return $a['age'] <=> $b['age'];

});

// Print the sorted array

print_r($data);

You can also sort it by using array_multisort() function.

<?php

// Example multidimensional array

$data = array(

    array(

        "id" => 1,

        "name" => "John",

        "age" => 25

    ),

    array(

        "id" => 2,

        "name" => "Mike",

        "age" => 30

    ),

    array(

        "id" => 3,

        "name" => "Tina",

        "age" => 23

    )

);

// Sort the array by the "age" key

array_multisort(array_column($data, 'age'), SORT_ASC, $data);

// Print the sorted array

print_r($data);

Here, array_column() is used to extract the values of a single column from the multi-dimensional array, and then sort that array using array_multisort(). The resulting sorted array is then used to sort the original multi-dimensional array.

Sort Multidimensional Array PHP by two keys.

You can use the array_multisort() function to sort a multidimensional array by multiple keys. Here's an example of how you can sort a multidimensional array by two keys, "age" and "name":

<?php

// Example multidimensional array

$data = array(

    array(

        "id" => 1,

        "name" => "John",

        "age" => 25

    ),

    array(

        "id" => 2,

        "name" => "Mike",

        "age" => 30

    ),

    array(

        "id" => 3,

        "name" => "Tina",

        "age" => 23

    )

);

// Extract the values of the "age" and "name" keys

$age = array_column($data, 'age');

$name = array_column($data, 'name');

// Sort the arrays by the "age" and "name" keys

array_multisort($age, SORT_ASC, $name, SORT_ASC, $data);

// Print the sorted array

print_r($data);

Here, array_column() is used to extract the values of the "age" and "name" keys. These arrays are then sorted using array_multisort(). The resulting sorted arrays are then used to sort the original multi-dimensional array, $data.

You can also use usort() function with your custom comparision function to sort by multiple keys.

usort($data, function($a, $b) {

    if ($a['age'] == $b['age']) {

        return strcmp($a['name'], $b['name']);

    }

    return $a['age'] <=> $b['age'];

});

In this example, first it checks if age is same for both elements, if yes then it compares the name, otherwise it compares the age.