ListOperation.php
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ListOperation.php
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	<?php
	class ListOperation {
	/**
	* Adds two lists
	*
	* @param Array $a The left list
	* @param Array $b The right list
	* @return Array The resultant list
	*/
	public static function Add ($a, $b) {
	return array_merge($a, $b);
	}

	/**
	* Intersects two lists
	*
	* @param Array $a The left list
	* @param Array $b The right list
	* @return Array The resultant list
	*/
	public static function Intersect ($a, $b) {
	if (count($a) == 0 \|\| count($b) == 0) { return array(); }

	return array_intersect($a, $b);
	}

	/**
	* Substracts a list from another list
	*
	* @param Array $a The left list
	* @param Array $b The right list
	* @return Array The resultant list
	*/
	public static function Substract ($a, $b) {
	if (count($b) == 0) { return $a; }
	$result = array();
	foreach ($a as $key => $value) {
	$toRemove = false;
	foreach ($b as $itemToRemove) {
	if ($value == $itemToRemove) {
	$toRemove = true;
	break;
	}
	}
	if (!$toRemove) $result[$key] = $value;
	}
	return $result;
	}
	}