How can the PHP function 'usort' be used to sort an array and delete specific elements within a callback function?

To use the PHP function 'usort' to sort an array and delete specific elements within a callback function, you can define a custom callback function that compares elements and removes the ones you want to delete. Within the callback function, you can use the 'unset' function to remove specific elements based on your criteria. This allows you to sort the array while also deleting elements that meet certain conditions. 

// Sample array to be sorted and modified
$array = [3, 1, 5, 2, 4];

// Custom callback function for sorting and deleting specific elements
usort($array, function($a, $b) {
    // Custom sorting logic
    return $a - $b;
});

// Custom callback function to delete elements less than 3
foreach ($array as $key => $value) {
    if ($value < 3) {
        unset($array[$key]);
    }
}

// Output the sorted and modified array
print_r($array);

Keywords

PHP usort array sort callback function

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