This article explains how PHP’s automatic garbage collector works, detailing reference‑counting, zval structures, handling of scalar and composite types, cycle detection, configuration options, and practical debugging techniques using Xdebug and code samples.
This article examines how PHP stores variables internally by analyzing the zval structure defined in the C source code, detailing its fields, type flags, memory layout, and associated macros, and explains why each variable occupies 16 bytes at runtime.
This tutorial walks through PHP 7.4’s internal zend_string and zval structures, explains their role in binary‑safe strings and copy‑on‑write memory management, and demonstrates step‑by‑step debugging with GDB to inspect variable states and reference counts.
The article analyzes PHP7's memory optimizations by comparing the zval and HashTable structures of PHP 5.3 and PHP 7.2, showing how reduced sizes and better cache‑line alignment lead to significant performance improvements.
This article explains PHP's core zval structure, how different variable types are stored, and the mechanisms of reference counting, copy‑on‑write, and garbage collection that enable efficient memory management in the Zend engine.
This article demystifies PHP’s internal architecture, covering its design philosophy, four‑layer system, SAPI interfaces, execution flow with opcodes, the Zend hash table, variable handling via zval, reference counting, and resource management, providing a comprehensive guide for backend developers.
