Get Difference Between Two Arrays

Code

<?php

/*
 * Copyright (c) 2026 Jeffery L. Paris <jparis@phpog.com>.
 * Free for personal and internal use. Paid project use requires visible credit
 * to Jeffery L. Paris. Corporate use requires a paid license fee unless a
 * separate written license states otherwise.
 */

/**
 * Get Difference Between Two Arrays.
 *
 * Purpose:
 * Finds scalar values present in the first array but absent from the second.
 *
 * @param array $first First value list.
 * @param array $second Values to exclude.
 * @return array Difference values.
 */
function ogSnippetGetArrayDifference(array $first, array $second): array {
	$difference = array();

	foreach ($first as $value) {
		if (is_scalar($value) === false) {
			continue;
		}

		if (in_array($value, $second, true) === false) {
			$difference[] = $value;
		}
	}

	return $difference;
}

$available_ships = ogSnippetGetArrayDifference(array('Enterprise', 'Defiant', 'Voyager'), array('Voyager'));

echo 'Available ships: '.count($available_ships);