Mastering PHP: How to Elegantly Filter an Array by Keys Using Values from Another Array

In PHP development, it's a common task to filter an associative array based on a list of keys provided in another array. This article details two primary methods: using the highly efficient `array_intersect_key` built-in function and the easy-to-understand `foreach` loop. Through concrete code examples, we'll compare their performance and use cases, helping you master the skill of choosing the best solution for different scenarios and write more professional, efficient PHP code.