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PHP App Config

A PHP framework-agnostic approach to make the current config available to PHP applications and shell-scripts.

For use by the application wherever it may be fit, for instance in the application's / PHP framework's configuration files.

Installation

• Install via composer:

• Copy the example/config folder into the root directory of your project.

• Make sure that all app entry scripts include the file called include.php right after including the composer autoloader (adjust the path as necessary in each entry script):

• Replace config vars in your app with the corresponding PHP constants. Example of usage within Yii configuration:

Before:

'db' => array(
    'connectionString' => 'mysql:host=localhost;dbname=db',
    'emulatePrepare' => true,
    'username' => 'root',
    'password' => 'supersecret',
    'charset' => 'utf8',
    'enableParamLogging' => true, // Log SQL parameters
    //'schemaCachingDuration'=>3600*24,
),

After:

'db' => array(
    'connectionString' => 'mysql:host=' . DATABASE_HOST . (defined('DATABASE_PORT') && DATABASE_PORT != '' ? ';port=' . DATABASE_PORT : '') . ';dbname=' . DATABASE_NAME,
    'emulatePrepare' => true,
    'username' => DATABASE_USER,
    'password' => DATABASE_PASSWORD,
    'charset' => 'utf8',
    'enableParamLogging' => true, // Log SQL parameters
    //'schemaCachingDuration'=>3600*24,
),

How it works

Configuration directives are looked for in the following places:

• $_ENV (which can be populated during a bootstrapping phase as in the local example config file)
• php-fpm environment variables (set in php-fpm configuration files and available through getenv())
• apache sub-process environment variables (set in Apache 2.x vhost config and available through apache_getenv())
• php-cgi params (set in nginx location blocks using fastcgi_param and available through $_SERVER)

The include.php file will load a file (defaulting to project-root/config/local/include.php) that defines what application-specific configuration directives to expect.

To change the expected config include file, set the CONFIG_INCLUDE environment variable to the path to the include relative to the project root. For instance, in order to use project-root/config/remote/include.php, set the CONFIG_INCLUDE environment variable to config/remote/include.php.

Within the config include file, you define which directives to expect using the Config::expect() method:

Config::expect("DATABASE_URL", $default = null, $required = true);

The include.php file will then call Config::defineConstants() which will define expected configuration directives as constants.

Using the example config includes

The included example configuration includes sample config profiles used to deploy to Heroku-style services and/or running the code locally.

Remote deployment (Docker Cloud / Platform as a Service)

• Deploy the app to Docker Cloud or a PaaS
• Set the CONFIG_INCLUDE config var to config/remote/include.php

Example - Heroku

• Set the expected config vars (DATABASE_URL, GA_TRACKING_ID etc) to their respective values

Your app should now run on Heroku using the expected config vars as PHP constants.

Local

The example local config include will first expect the remote, then load the overrides.php file, followed by a non-versioned file called secrets.php. To use the local configuration:

• Create ang gitignore your secret local configuration file

• Add general defaults/overrides that all developers use locally in the overrides.php file
• Add secret defaults/overrides that should not be versioned to the secrets.php file

Your app should now run locally using the expected config vars as PHP constants.

Useful commands

To show your current config, you can run the following in a shell:

php -d variables_order="EGPCS" vendor/neam/php-app-config/export.php

To use the config in a shell-script:

source vendor/neam/php-app-config/shell-export.sh
# now the config is available to the shell-script

To export the current configuration to a file which can be sourced by a shell script:

php -d variables_order="EGPCS" vendor/neam/php-app-config/export.php > .exported.php-app-config.inc.sh