How can one efficiently filter out unnecessary elements from an array in PHP after processing checkbox inputs?

When processing checkbox inputs in PHP, you may end up with an array containing both checked and unchecked values. To efficiently filter out unnecessary elements from the array, you can use the array_filter function in combination with a callback function that checks for the checked values. This will allow you to remove any unchecked elements and work only with the necessary data.

// Assuming $checkboxes is an array containing checkbox inputs

// Filter out unchecked elements from the array
$checkedValues = array_filter($checkboxes, function($value) {
    return $value === "checked";
});

// Now $checkedValues will only contain the checked elements