# Config Reference

PHP-Prefixer works based on Composer (opens new window) as the dependency management tool. It allows you to declare the libraries your project depends on and manages (install/update) them for you. For more information about Composer, please visit https://getcomposer.org/ (opens new window).

Composer is a dependency management tool in PHP. It allows you to declare the libraries your project depends on and manages (install/update) them for you.

To start using Composer in your project, all you need is a composer.json file. This file describes the project's dependencies and may contain other metadata.

Use the extra attribute in the composer.json file to declare arbitrary extra data. PHP-Prefixer declares the service definitions inside the extra attribute with a php-prefixer area.

This is a sample composer.json. Use it as a reference for all the available attributes in the extra / php-prefixer section:

    "name": "php-prefixer/getting-started",
    "autoload": {
        "psr-4": {
            "Acme\\": "src/"
    "require": {
        "monolog/monolog": "1.0.*"
    "extra": {
        "php-prefixer": {
            "project-name": "PHP-Prefixer Getting Started",
            "namespaces-prefix": "PPP",
            "global-scope-prefix": "PPP_",
            "disclaimer": true,
            "add-dependencies": {
                "nesbot": [
            "exclude-paths": [
            "exclude-from-autoload": [
            "ignore-from-global-scope": [
            "ignore-libraries": [
            "ignore-paths": [
            "prefix-extra-folders": [

# Attributes of the PHP-Prefixer configuration

Name Description
project-name (*) Name of the project. Only informational. It is used to create the "Header Comment" of processed files. MANDATORY.
namespaces-prefix (*) The prefix for namespaces. For instance: PPP applied to namespace Monolog; generates namespace PPP\Monolog;. MANDATORY.
global-scope-prefix (*) The prefix for global objects such as functions. For instance: PPP_ applied to function base_path() generates function PPP_base_path(). MANDATORY.
disclaimer Flag to disable the rendering of the "Header Comment" of processed files.
add-dependencies Declaration of additional dependencies that cannot be inferred from the Composer schema.
exclude-paths Paths to be excluded entirely from the final ZIP file. Critical files included in the autoloader cannot be excluded.
exclude-from-autoload Libraries to be excluded entirely from the final autoload files.
ignore-from-global-scope Objects to be ignored in the prefixing process.
ignore-libraries Libraries to be ignored in the prefixing process.
ignore-paths Paths to folders and files ignored in the prefixing process.
prefix-extra-folders Additional root folders to be included in the prefixing process. All prefixers are applied to these folders.

# Ignored Libraries

This is the list of libraries that are ignored by default by the prefixer processor:

# Polyfills

  • symfony/polyfill-apcu
  • symfony/polyfill-ctype
  • symfony/polyfill-php54
  • symfony/polyfill-php55
  • symfony/polyfill-php56
  • symfony/polyfill-php70
  • symfony/polyfill-php71
  • symfony/polyfill-php72
  • symfony/polyfill-php73
  • symfony/polyfill-php74
  • symfony/polyfill-php80
  • symfony/polyfill-iconv
  • symfony/polyfill-intl-grapheme
  • symfony/polyfill-intl-idn
  • symfony/polyfill-intl-icu
  • symfony/polyfill-intl-messageformatter
  • symfony/polyfill-intl-normalizer
  • symfony/polyfill-mbstring
  • symfony/polyfill-util
  • symfony/polyfill-uuid

# FIG Standards

  • fig/cache-util
  • fig/event-dispatcher-util
  • fig/http-message-util
  • fig/link-util
  • psr/cache
  • psr/container
  • psr/event-dispatcher
  • psr/http-client
  • psr/http-factory
  • psr/http-message
  • psr/http-server-handler
  • psr/http-server-middleware
  • psr/link
  • psr/log
  • psr/simple-cache

# Other Libraries

  • paragonie/random_compat
  • ralouphie/getallheaders