---
id: "kb-2026-00303"
title: "PHP Language"
schema_type: "TechArticle"
category: "computer-science"
language: "en"
confidence: "medium"
last_verified: "2026-05-22"
created_date: "2026-05-22"
generation_method: "human_only"
derived_from_human_seed: true
conflict_of_interest: "none_declared"
is_live_document: false
data_period: "static"
atomic_facts:
  - id: "fact-computer-science-001"
    statement: "PHP began in 1994 as Rasmus Lerdorf's Personal Home Page Tools and later evolved into PHP/FI and then PHP: Hypertext Preprocessor."
    source_title: "History of PHP"
    source_url: "https://www.php.net/manual/en/history.php.php"
    confidence: "medium"
  - id: "fact-computer-science-002"
    statement: "PHP 8.0 introduced named arguments, union types, attributes, constructor property promotion, match expressions, the nullsafe operator, and a JIT compiler."
    source_title: "PHP 8.0.0 Release Announcement"
    source_url: "https://www.php.net/releases/8.0/en.php"
    confidence: "medium"
  - id: "fact-computer-science-003"
    statement: "PHP 8.1 added language features including enumerations, fibers, and readonly properties."
    source_title: "PHP 8.1.0 Release Announcement"
    source_url: "https://www.php.net/releases/8.1/en.php"
    confidence: "medium"
  - id: "fact-computer-science-004"
    statement: "PHP 8.4 includes property hooks and asymmetric property visibility among its language changes."
    source_title: "PHP 8.4 Release Announcement"
    source_url: "https://www.php.net/releases/8.4/en.php"
    confidence: "medium"
  - id: "fact-computer-science-005"
    statement: "PHP-FPM is the FastCGI Process Manager implementation documented by the PHP manual."
    source_title: "FastCGI Process Manager (FPM)"
    source_url: "https://www.php.net/manual/en/install.fpm.php"
    confidence: "medium"
completeness: 0.88
known_gaps:
  - "This field is under active development; new PHP releases may add or deprecate features"
  - "Certain ecosystem topics such as Composer, PSR standards, and major frameworks are summarized rather than exhaustively covered"
primary_sources:
  - title: "History of PHP"
    type: "documentation"
    year: 2026
    url: "https://www.php.net/manual/en/history.php.php"
    institution: "The PHP Documentation Group"
  - title: "PHP 8.0.0 Release Announcement"
    type: "release_notes"
    year: 2020
    url: "https://www.php.net/releases/8.0/en.php"
    institution: "The PHP Group"
  - title: "PHP 8.1.0 Release Announcement"
    type: "release_notes"
    year: 2021
    url: "https://www.php.net/releases/8.1/en.php"
    institution: "The PHP Group"
  - title: "PHP 8.4 Release Announcement"
    type: "release_notes"
    year: 2024
    url: "https://www.php.net/releases/8.4/en.php"
    institution: "The PHP Group"
  - title: "FastCGI Process Manager (FPM)"
    type: "documentation"
    year: 2026
    url: "https://www.php.net/manual/en/install.fpm.php"
    institution: "The PHP Documentation Group"
secondary_sources: []
---

## TL;DR

PHP is a server-side scripting language whose history starts with Rasmus Lerdorf's 1994 Personal Home Page Tools. Modern PHP 8.x added major language features such as union types, attributes, match expressions, enums, fibers, property hooks, and asymmetric visibility.

## Core Explanation

PHP remains closely associated with server-rendered web applications and CMS ecosystems. PHP-FPM is the documented FastCGI Process Manager implementation used in many production deployments. Modern PHP development also commonly relies on Composer, PSR conventions, static analysis, and mature frameworks, though those ecosystem details are beyond this article's core scope.

## Further Reading

- [History of PHP](https://www.php.net/manual/en/history.php.php)
- [PHP 8.0.0 Release Announcement](https://www.php.net/releases/8.0/en.php)
- [PHP 8.1.0 Release Announcement](https://www.php.net/releases/8.1/en.php)
- [PHP 8.4 Release Announcement](https://www.php.net/releases/8.4/en.php)
- [FastCGI Process Manager (FPM)](https://www.php.net/manual/en/install.fpm.php)

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