This article explains why PHP caching is essential for web performance and details three main techniques—page caching with output buffering, data caching using extensions like Memcached or APCu, and file caching with file I/O functions—plus best practices for updates, expiration, and avoiding cache penetration.
This article explains key PHP performance optimization strategies—including database query tuning, efficient coding practices, and various caching methods such as Redis and file‑based page caching—providing concrete code examples to improve response time and system stability.
This article explains PHP data caching techniques—including memory, file, and database caches—provides practical code samples, and outlines key index design principles such as uniqueness, expiration, hotspot optimization, efficient updates, and hierarchical caching to improve performance.
The article walks through Linux’s mmap file‑read workflow—from the kernel entry point and VMA creation, through page‑fault handling that allocates pages and invokes synchronous or asynchronous readahead, to munmap’s unmapping steps and the deferred file‑cache reclamation mechanisms.
This article explains how Elasticsearch processes queries across shards, identifies two key performance bottlenecks—query computation time and segment file I/O—and offers practical optimization strategies such as simplifying query logic, maximizing OS file cache usage, increasing memory, reducing stored data, and applying hot‑cold data separation.
This article explains the security flaws in PHP 7's OPcache engine, demonstrates a novel binary webshell attack that bypasses file‑write protections, and provides step‑by‑step exploitation techniques including file‑cache manipulation, memory‑cache bypass, and timestamp spoofing.
This article explains why the Linux I/O subsystem is the slowest part of the system, describes page‑level disk access, major and minor page faults, the file buffer cache, page types, write‑back mechanisms, monitoring tools, and practical tips for reducing I/O latency.
