azure-storage-common/src/Common/Internal/ConnectionStringSource.php
private static function _init()
    {
        if (!self::$_isInitialized) {
            self::$_defaultSources = array(
                self::ENVIRONMENT_SOURCE => array(__CLASS__, 'environmentSource')
            );
            self::$_isInitialized  = true;
        }
    }
private static function _init()
    {
        if (!self::$_isInitialized) {
            self::$_defaultSources = array(
                self::ENVIRONMENT_SOURCE => array(__CLASS__, 'environmentSource')
            );
            self::$_isInitialized  = true;
        }
    }
Initializes the default sources.

@return void