PHP-FPM

aid: php-fpm
name: PHP-FPM
description: >-
  PHP-FPM (FastCGI Process Manager) is the primary PHP FastCGI implementation
  bundled with PHP for handling heavy-loaded sites, providing advanced
  process management with multiple worker pools, graceful start/stop,
  adaptive process spawning (static, dynamic, ondemand), slowlog tracking,
  and accelerated upload support. It is configured via php.ini-style pool
  files and is typically deployed behind a web server such as Nginx, Apache,
  Caddy, or LiteSpeed via FastCGI. PHP-FPM exposes operational status pages
  (in plain, JSON, XML, OpenMetrics, and HTML formats) but does not provide
  a public HTTP API; it runs only on POSIX systems that support fork().
type: Index
image: https://kinlane-productions.s3.amazonaws.com/apis-json/apis-json-logo.jpg
tags:
  - PHP
  - FastCGI
  - Process Manager
  - Web Server
  - Application Server
  - Open Source
url: >-
  https://raw.githubusercontent.com/api-evangelist/php-fpm/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-05-11'
specificationVersion: '0.19'
apis:
  - aid: php-fpm:status-endpoint
    name: PHP-FPM Status Endpoint
    description: >-
      Operational status endpoint exposed by PHP-FPM via the pm.status_path
      directive. Returns pool statistics (active processes, idle processes,
      accepted connections, slow requests) in plain text, JSON, XML,
      OpenMetrics, or HTML. There is no public API; the endpoint is served
      by the local web server through FastCGI on user-defined paths.
    humanURL: https://www.php.net/manual/en/install.fpm.configuration.php
    baseURL: http://localhost
    tags:
      - Status
      - Monitoring
      - OpenMetrics
      - Process Manager
    properties:
      - type: Documentation
        url: https://www.php.net/manual/en/install.fpm.php
      - type: Configuration
        url: https://www.php.net/manual/en/install.fpm.configuration.php
      - type: Installation
        url: https://www.php.net/manual/en/install.fpm.install.php

common:
  - type: Website
    url: https://www.php.net/
  - type: Documentation
    url: https://www.php.net/manual/en/install.fpm.php
  - type: Download
    url: https://www.php.net/downloads.php
  - type: GitHub Repository
    url: https://github.com/php/php-src
  - type: Issue Tracker
    url: https://github.com/php/php-src/issues
features:
  - name: Worker Pool Management
    description: >-
      Multiple independent worker pools per FPM instance, each with its own
      uid/gid, chroot, environment, php.ini overrides, and listen socket.
  - name: Adaptive Process Spawning
    description: >-
      Static, dynamic, and ondemand process management modes that balance
      latency, memory, and concurrency for different workloads.
  - name: Slowlog and Diagnostics
    description: >-
      Per-pool slowlog captures backtraces of requests that exceed a
      configurable execution time threshold.
  - name: Status and Ping Endpoints
    description: >-
      Built-in pm.status_path and ping.path endpoints for health checks
      and pool-level metrics in plain, JSON, XML, OpenMetrics, or HTML.
  - name: Accelerated Upload Support
    description: >-
      Offload large file uploads to FPM-managed temporary storage to
      reduce front-end web server load.
  - name: Background Task Support
    description: >-
      fastcgi_finish_request() lets PHP scripts return a response to the
      client and continue processing in the background.
maintainers:
  - FN: Kin Lane
    email: [email protected]