What are the differences between array_multisort and usort in PHP, and when should each be used?

array_multisort is used to sort multiple arrays or a multi-dimensional array based on one or more key values, while usort is used to sort a single array using a user-defined comparison function. array_multisort is more suitable for sorting multiple arrays simultaneously, while usort is more flexible and allows for custom sorting logic. Example PHP code snippet for using array_multisort: 

<?php
$names = array("John", "Alice", "Bob");
$ages = array(25, 30, 22);

array_multisort($ages, $names);

print_r($names);
print_r($ages);
?>
```

Example PHP code snippet for using usort:

```php
<?php
$numbers = array(5, 3, 8, 1, 2);

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

print_r($numbers);
?>

Keywords

array_multisort usort sorting comparison function multidimensional arrays

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