Скачать или смотреть PHP Developer Should Know WeakMap PHP8.0

If you are still using arrays to store class objects, be alert! Because when you store objects in an array and later unset them, the references still exist in memory. This creates garbage collection issues and leads to memory leaks. To solve this, PHP 8.0 introduced WeakMap. WeakMap stores class objects as keys. When you unset the object, it’s automatically removed from memory. That means: no leakage, no garbage collection problem. But remember: WeakMap only works with objects, and the object must be the key. for example, In an e-commerce website, if you want to store cart data in cache, you can use WeakMap. Once you unset it, the data is automatically cleared from memory. Similarly, you can use WeakMap for: Caching systems, Game servers, Debugging, and anywhere you’re dealing with large heavy objects that get created and destroyed frequently. In short: WeakMap = Objects as keys, Automatic cleanup, and No memory leak.

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