Way to set up the Yii framework using environment variable in the <yii project>/protected/config/main.php

main.php

<?php

// The path where to put all the logs for the API.
// For instance on OSX environment this would be setup as: export YII_PATH_LOG=/var/log
$yii_path_log = getenv('YII_PATH_LOG');

if(!$yii_path_log) {
  echo 'No YII_PATH_LOG set in user environment.';
  exit;
}

// The path where all the files like sessions, etc are stored during runtime.
// On OSX env: export YII_PATH_RUNTIME=/Library/WebServer/api_runtime
$yii_path_runtime = getenv('YII_PATH_RUNTIME');

if(!$yii_path_runtime) {
  echo 'No YII_PATH_RUNTIME set in user environment.';
  exit;
}

// The path where all the files like sessions, etc are stored during runtime.
// On OSX env: export YII_PATH_RUNTIME=/Library/WebServer/api_runtime
$yii_path_assets = getenv('YII_PATH_ASSETS');

if(!$yii_path_assets) {
  echo 'No YII_PATH_ASSETS set in user environment.';
  exit;
}

// uncomment the following to define a path alias
// Yii::setPathOfAlias('local','path/to/local-folder');

// This is the main Web application configuration. Any writable
// CWebApplication properties can be configured here.
// Use it here to re define the runtime path
return array(
  'basePath' => dirname(__FILE__) . DIRECTORY_SEPARATOR . '..',
  'name' => 'my REST API',
  'runtimePath' => getenv('YII_PATH_RUNTIME'),
(...)