Efficiently calculate array intersection and union using PHP collection classes

Use the PHP collection class to efficiently calculate array intersection and union. The specific steps are as follows: Use the intersect() method to calculate the intersection: elements that appear in two arrays at the same time. Use the union() method to calculate the union of elements that appear in any array. Practical case: Compare shopping cart contents to understand users’ overlapping products and unique products.

Use PHP collection class to efficiently calculate the intersection and union of arrays

In PHP, use the collection class to efficiently calculate arrays The intersection and union of . The collection class provides a series of convenient methods to manipulate collections, making related tasks easier.

Install the collection class

You can use Composer to install the PHP collection class:

composer require phpcollection/phpcollection

Calculate intersection

Intersection refers to elements that appear in two arrays at the same time. You can use the intersect() method to calculate the intersection:

$array1 = [1, 2, 3, 4, 5];
$array2 = [3, 4, 5, 6, 7];

$intersection = \PhpCollection\Set::fromArray($array1)->intersect(\PhpCollection\Set::fromArray($array2))->toArray();

print_r($intersection); // [3, 4, 5]

Calculate the union

The union refers to the elements that appear in any array. You can use the union() method to calculate the union:

$union = \PhpCollection\Set::fromArray($array1)->union(\PhpCollection\Set::fromArray($array2))->toArray();

print_r($union); // [1, 2, 3, 4, 5, 6, 7]

Practical case: Compare the contents of two users' shopping carts

Assume you have A shopping cart system where you need to compare the items in two users' shopping carts. You can use the collection class to efficiently calculate the intersection and union of items to understand which items users overlap and which items are unique.

$user1Cart = [1, 2, 3, 4, 5];
$user2Cart = [3, 4, 5, 6, 7];

$intersection = \PhpCollection\Set::fromArray($user1Cart)->intersect(\PhpCollection\Set::fromArray($user2Cart))->toArray();
$union = \PhpCollection\Set::fromArray($user1Cart)->union(\PhpCollection\Set::fromArray($user2Cart))->toArray();

echo "重叠商品：";
print_r($intersection);

echo "所有商品：";
print_r($union);

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