Composer script handling your ignored app_loader.ini file

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v2.0 2016-03-10 21:38 UTC


This package provides a unified front controller for Symfony, merging all the options into a single AppLoader. The options are all overridable using a custom front controller or extending the AppLoader.

This tool uses a script that will ask for your parameters when running composer install or update, very similar to incenteev/composer-parameter-handler.


Add the following in your root composer.json file:

    "require": {
        "wemakecustom/symfony-app-loader": "~1.0@dev"
    "scripts": {
        "post-install-cmd": [
        "post-update-cmd": [

Replace web/app.php with the one in this package. See the section Overridding options using front controllers for more details.

Replace app/console with the one in this package.

Ignore your ini file in .gitignore:


Composer script configuration

Different file and dist file

The app/config/app_loader.ini will then be created or updated by the composer script, to match the structure of the dist file app/config/app_loader.ini.dist by asking you the missing parameters. If no app/config/app_loader.ini.dist is available in your Symfony installation, it will use a default one.

By default, the dist file is assumed to be in the same place than the parameters file, suffixed by .dist. This can be changed in the configuration:

    "extra": {
        "wmc-app-loader": {
            "file": "app/config/app_loader.ini",
            "dist-file": "some/other/folder/to/other/parameters/file/app_loader.ini.dist"

Keep outdated parameters

The script handler will ask you interactively for parameters which are missing in the parameters file, using the value of the dist file as default value. All prompted values are parsed as inline INI, to allow you to define true, false or numbers easily. If composer is run in a non-interactive mode, the values of the dist file will be used for missing parameters.

Warning: This script removes outdated params from app_loader.ini which are not in app_loader.ini.dist. If you need to keep outdated params you can use keep-outdated param in the configuration:

    "extra": {
        "wmc-app-loader": {
            "keep-outdated": true,

Using environment variables to set the parameters

For your prod environment, using an interactive prompt may not be possible when deploying. In this case, you can rely on environment variables to provide the parameters. This is achieved by providing a map between environment variables and the parameters they should fill:

    "extra": {
        "wmc-app-loader": {
            "env-map": {
                "my_first_param": "MY_FIRST_PARAM",
                "my_second_param": "MY_SECOND_PARAM"

If an environment variable is set, its value will always replace the value set in the existing parameters file.

As environment variables can only be strings, they are also parsed as inline INI values to allows specifying false, true or numbers easily.

Warning: This parameters handler will overwrite any comments or spaces into your app_loader.ini file so handle with care. So if you want to give format and comments to your parameter's file you should do it on your dist version.

Customizing behavior

Overridding options using front controllers

You can find the standard controllers in web/app*.php. It is a good idea to copy them all for a development configuration. While not strictly required, it may be good to leave only web/app.php in a production environment.

As you can see in the examples, you can override any option after instantiating the AppLoader, but before $app_loader->run();

Available options are:

  • environment: (dev|test|prod)
  • debug: (true|false) guessed automatically on environment == dev
  • http_cache: (true|false) whether or not to use Symfony HTTP reverse proxy
  • localhost_only: (true|false) whether or not to limit request to localhost when in dev mode
  • umask_fix: (true|false) whether or not to change the umask to 0000
  • apc_cache_id: (false|string) if a valid string, use this as an APC id for the caches

Overridding behavior by extending AppLoader

The provided AppLoader is fully overridable. You can extend it and modify your fron controllers to use yours instead. See sample/AppLoader for an example.