Explain advanced PHP memory optimization strategies for enterprise-scale applications.

Enterprise PHP memory optimization focuses on reducing allocations, fragmentation, object overhead, and unnecessary data duplication.

Memory optimization becomes critical in high-scale PHP environments because PHP-FPM workers multiply memory usage across hundreds or thousands of processes.

Key optimization areas:

PHP delays copying until mutation occurs.

PHP arrays are expensive hash tables. Large arrays consume substantial memory.

Duplicate immutable strings share memory.

Large dependency trees increase heap pressure.

Generators avoid loading entire datasets.

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