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Furthermore, the "pool" metaphor extends to resource management. Each spider process consumes memory for TCP connections, HTTP headers, and parsed data. PHP's memory limit must be carefully configured, and workers should be recycled periodically to avoid leaks. A well-designed pool monitors its own health – if a worker stalls or returns errors repeatedly, it is killed and respawned. The concept also involves "rate limiting" at both the global and per-domain levels to comply with robots.txt and legal constraints. In summary, a PHP spider pool is not just a code snippet; it's a system that combines queue management, concurrent I/O, proxy rotation, and fault tolerance. In the following sections, we will dissect the actual source code components that make this possible.