What is the difference between array_multisort() and usort() functions in PHP?

The main difference between array_multisort() and usort() functions in PHP is that array_multisort() is used to sort multiple arrays or a multi-dimensional array, while usort() is used to sort a single array using a user-defined comparison function. If you need to sort multiple arrays or a multi-dimensional array, you should use array_multisort(). If you only need to sort a single array and want to define a custom sorting logic, usort() is the appropriate choice. 

// Example using array_multisort()
$array1 = [3, 1, 2];
$array2 = ['c', 'a', 'b'];

array_multisort($array1, $array2);

print_r($array1); // Output: [1, 2, 3]
print_r($array2); // Output: ['a', 'b', 'c']

// Example using usort()
$array = [3, 1, 2];

usort($array, function($a, $b) {
    return $a - $b;
});

print_r($array); // Output: [1, 2, 3]

Keywords

array_multisort usort PHP functions sorting comparison

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