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〖Two〗When dissecting the source code of a PHP spider pool, we encounter several critical components that must be implemented with care. The first is the task queue – typically a Redis list or a RabbitMQ queue. Using Redis is favored for its simplicity and atomic operations like `RPOP` and `LPUSH`, which allow multiple workers to consume tasks without conflicts. A common pattern is to have a main producer script that seeds the initial URLs (e.g., sitemaps or a database of target pages), and then workers continuously pull from the queue. The code looks like: `$task = $redis->blpop('spider:queue', 5);` – this blocks for up to 5 seconds waiting for a task, avoiding busy-waiting.