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Pimcore's configuration can be found in several places:

  • Configurations in var/config/*.php are written from the admin interface. For example the system.php file contains the settings written from System Settings
  • The Symfony configuration tree (mainly distributed throughout *.yml files) contains all Symfony related configuration. This configuration is partially populated from settings coming from other config files (e.g. the database credentials stored in system.php are used to configure the Doctrine Bundle configuration.
  • A set of PIMCORE_* constants which are used to resolve various filesystem paths

Symfony Configuration

Many aspects of Pimcore can be configured through the Symfony Config tree defined under the pimcore extension. These values can be changed through config files in app/config (e.g. app/config/config.yml)).

Pimcore additionally includes a set of standard configuration files which (in contrast to a standard Symfony project) are not located in app/config but in the PimcoreCoreBundle. This gives us the possibility to ship and update default configurations without affecting project code in app/. See Auto loading config and routing definitions for details how this works).

Standard configs will be merged with your custom config in app/config to build the final config tree. You can debug the values stored in the tree through the following command:

# this is a core Symfony command and works for every bundle, just omit the
# "pimcore" argument to get a list of all bundles
$ bin/console debug:config pimcore

In addition, you can print a reference of valid configuration sections with the following command:

$ bin/console config:dump-reference pimcore

Pimcore constants

Pimcore uses several constants for locating certain directories like logging, asses, versions etc. These constants are defined in /pimcore/config/constants.php.

If you need to overwrite these constants, e.g. for using a special directory for assets or versions at an object storage at AWS S3 you have multiple ways to do so:

  • Create a file in /app/constants.php setting the constants you need. Pimcore will skip setting any constants which are already defined.
  • Define an environment variable named after the constant. When defining a constant, Pimcore will look if an env variable with the same name is defined and use that instead of the default value.
  • Define an environment variable in a /.env file which will be automatically loaded through the DotEnv component if it exists. Environment variables defined here will have the same effect as "real" environment variables.

An example file (constants.example.php) is shipped with Pimcore installation and could look like:


// to use this file you have to rename it to constants.php
// you can use this file to overwrite the constants defined in /pimcore/config/constants.php

define("PIMCORE_ASSET_DIRECTORY", "/custom/path/to/assets");
define("PIMCORE_TEMPORARY_DIRECTORY", "/my/tmp/path");

Please see /pimcore/config/constants.php for a list of defined constants.


There is one special constant PIMCORE_PROJECT_ROOT which is used to resolve the root directory (see Directory Structure) of the application. In constrast to the remaining constants, this constant is not defined in constants.php as it is already needed to resolve the path to the constants.php file itself. Instead, it is defined in Pimcore's entry points such as app.php in the following way:


if (!defined('PIMCORE_PROJECT_ROOT')) {
            ?: getenv('REDIRECT_PIMCORE_PROJECT_ROOT')
            ?: realpath(__DIR__ . '/..')

This means, you can influence the project root through an env variable (or by defining a constant before loading the entry point) if needed and Pimcore will fall back to its standard value if not defined. If you use Pimcore's standard directory layout as shipped in the zip file, you don't have to set anything, but if you need some kind of special setup you have full control over the used paths here.

In contrast to the other constants, PIMCORE_PROJECT_ROOT can not be set via .env Pimcore doesn't know where to look for a .env file at this point.

Adding logic to the startup process

If you need to execute code to influence Pimcore's startup process, you can do so by adding a file in /app/startup.php which will be automatically included as part of the bootstrap process. Specifically, it will be loaded after all other bootstrapping (loading the autoloader, parsing constants, ...) is done, but before the kernel is loaded and booted. This gives you the possibility to reconfigure environment settings before they are used and to configure the system for your needs. Examples:


// /app/startup.php

use \Symfony\Component\HttpFoundation\Request;

Request::setTrustedProxies(['', '']);