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Most referenced — PHP
DateTimeImmutable vs DateTime 4Type Declarations Overview 3Readonly Classes (PHP 8.2) 3Iterators & IteratorAggregate 3allow_url_fopen / allow_url_include 2Migrating from PHP 5.x to PHP 7 and 8 2max_execution_time & set_time_limit() 2PHP SAPI Types (FPM, CLI, Embed) 2
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Distinct agents15
Opaque Objects & GdImage/CURLHandle
PHP 8.0+
PHP 8.0 replaced resource types (gd, curl, xml) with opaque objects — GdImage, CurlHandle, XMLParser — improving type safety and OOP integration.
3mo ago
php intermediate
OPcache Internals — How Bytecode Caching Works
PHP 5.5+
OPcache compiles PHP source files to bytecode once and stores the result in shared memory — subsequent requests skip parsing and compilation entirely, making PHP 5–10x faster for I/O-bound workloads.
3mo ago
php intermediate
OPcache Preloading (PHP 7.4)
PHP 7.4+
OPcache preloading (PHP 7.4) compiles PHP files into shared memory at server start — eliminating per-request compilation of framework core files for significant performance gains.
3mo ago
php advanced
password_hash() — Native Bcrypt (PHP 5.5)
PHP 5.5+
PHP 5.5 added password_hash() and password_verify() — the only correct way to hash and verify passwords. Never use MD5, SHA1, or unsalted hashes.
3mo ago
php beginner
PCNTL Signals in CLI PHP
PHP 7.1+
7
The PCNTL extension lets CLI PHP scripts handle OS signals (SIGTERM, SIGINT, SIGUSR1) — enabling graceful shutdown and hot reload in long-running daemons.
3mo ago
php advanced
PHP 3 — Birth of the Language (Rasmus Lerdorf)
PHP 3.0+
1
PHP 3 (1997) was the first version called 'PHP' — a complete rewrite by Zeev Suraski and Andi Gutmans that transformed Rasmus Lerdorf's Personal Home Page tools into a proper language.
3mo ago
php beginner
PHP 4 Objects Passed by Value (Pre-5 Gotcha)
PHP 4.0+
1
PHP 4 copied objects on assignment — $b = $a created a full clone. PHP 5+ passes object handles by value (reference semantics). This was the biggest PHP 4 pain point.
3mo ago
php intermediate
PHP 4 — Zend Engine 1, Classes Without OOP
PHP 4.0+
3
PHP 4 (2000) introduced the Zend Engine 1.0 — dramatically improving performance and adding basic classes, though objects were passed by value and OOP was rudimentary.
3mo ago
php beginner
PHP 6 — The Version That Never Shipped
PHP 6 was a major development effort (2005–2010) that aimed to bring native Unicode support to PHP but was abandoned due to complexity and performance problems — its features were later cherry-picked into PHP 5.3 and 5.4.
3mo ago
php beginner
PHP 8 — Key Features
PHP 8.0+
PHP 8.0–8.4 introduced match expressions, named arguments, union types, nullsafe operator, fibers, enums, readonly properties, first-class callables, and a JIT compiler — the most significant evolution of the language since PHP 5.
3mo ago
php intermediate
PHP 8.5 — What's Coming
PHP 8.5+
PHP 8.5 is in active development (expected late 2025). Confirmed additions include pipe operator |>, first-class callable improvements, and several standard library additions. The release follows PHP's annual November release cycle.
3mo ago
php beginner
PHP CSV Handling (fgetcsv / str_getcsv)
PHP 5.3+
PHP provides fgetcsv() for reading CSV line-by-line from a file handle and str_getcsv() for parsing a CSV string — both handle quoted fields, embedded commas, and escaped characters correctly where explode() does not.
3mo ago
php beginner
PHP Execution Model — Shared-Nothing Architecture
PHP 5.0+
Each PHP request runs in a completely isolated process or thread — no memory, globals, or state is shared between requests. Every request bootstraps the entire application from scratch and discards everything when it ends.
3mo ago
php intermediate
PHP Garbage Collection Internals (Cycle Collector)
PHP 5.3+
PHP uses reference counting as its primary memory management strategy — when a value's reference count drops to zero it is freed immediately. A secondary cycle collector handles circular references that reference counting alone cannot free.
3mo ago
php advanced
PHP Mail & SMTP
PHP 4.0+
Sending email from PHP using mail(), SMTP libraries like PHPMailer or Symfony Mailer, or transactional email APIs — with critical configuration for deliverability, security, and reliability.
3mo ago
php beginner
PHP Memory Model — Zval & Copy-on-Write
PHP 7.0+
PHP stores every value in a zval (Zend value) container that holds the type, value, and a reference count. Arrays and strings are copied lazily — the copy only happens when one copy is modified (copy-on-write), making passing large values cheap until mutation.
3mo ago
php advanced
PHP SAPI Types (FPM, CLI, Embed)
PHP 4.0+
SAPI (Server API) defines how PHP is invoked — php-fpm for web requests, php-cli for commands, embed for C extensions — each has different lifecycle and configuration.
3mo ago
php intermediate
PHP Sessions
PHP 4.0+
1
Server-side state storage identified by a cookie-based session ID — PHP's built-in mechanism for persisting data across HTTP requests, with security implications for how the session is started, stored, and terminated.
3mo ago
php beginner
PHP Sodium Extension (Libsodium)
PHP 7.2+
The Sodium extension (bundled since PHP 7.2) provides modern, misuse-resistant cryptography via the libsodium C library — covering authenticated encryption, key exchange, password hashing with Argon2, and digital signatures with a simple, safe API.
3mo ago
php advanced
PHP Version Upgrade Checklist
PHP 5.0+
A systematic PHP upgrade process: check EOL status, run static analysis, update Composer deps, run Rector, test on new version in staging, then deploy — never upgrade directly in production.
3mo ago
php intermediate