Sort multidimensional arrays in php

In PHP, you can sort multidimensional arrays using the array_multisort() function. Here’s an example of how to sort a multidimensional array in ascending order based on a specific column:

// Sample multidimensional array
$data = array(
    array('id' => 1, 'name' => 'John', 'age' => 25),
    array('id' => 2, 'name' => 'Mary', 'age' => 20),
    array('id' => 3, 'name' => 'Peter', 'age' => 30)
);

// Sort the array in ascending order based on age
$age = array_column($data, 'age');
array_multisort($age, SORT_ASC, $data);

// Print the sorted array
print_r($data);

In this example, we first define a multidimensional array $data with three columns: id, name, and age. We then use the array_column() function to extract the age column from the array and store it in a separate array $age. Finally, we use the array_multisort() function to sort the original array $data based on the values in $age.

You can also sort the array in descending order by changing SORT_ASC to SORT_DESC. Additionally, you can sort the array based on multiple columns by passing multiple arrays to array_multisort().

You can sort a multidimensional array without using a built-in function like array_multisort(), Just using a custom sorting function

// Sample multidimensional array
$data = array(
    array('id' => 1, 'name' => 'John', 'age' => 25),
    array('id' => 2, 'name' => 'Mary', 'age' => 20),
    array('id' => 3, 'name' => 'Peter', 'age' => 30)
);

// Define a custom sorting function
function sortByAge($a, $b) {
    return $a['age'] - $b['age'];
}

// Sort the array in ascending order based on age
usort($data, 'sortByAge');

// Print the sorted array
print_r($data);

Note: The original keys of the array will be lost after sorting. If you want to preserve the keys, use the uasort() function instead of array_multisort().