src/Silex/Provider/YamlConfigServiceProvider.php
protected function setYamlPatameters()
    {
        foreach ($this->_configSettings['parameters'] as $key => $value) {
            $this->_vars['%'.$key.'%'] = $value;
        }
    }
protected function setYamlPatameters()
    {
        foreach ($this->_configSettings['parameters'] as $key => $value) {
            $this->_vars['%'.$key.'%'] = $value;
        }
    }
Sets YML parameters

@return void