framework/base/Module.php
public function getBasePath()
    {
        if ($this->_basePath === null) {
            $class = new \ReflectionClass($this);
            $this->_basePath = dirname($class->getFileName());
        }

        return $this->_basePath;
    }
public function getBasePath()
    {
        if ($this->_basePath === null) {
            $class = new \ReflectionClass($this);
            $this->_basePath = dirname($class->getFileName());
        }

        return $this->_basePath;
    }
Returns the root directory of the module.
It defaults to the directory containing the module class file.
@return string the root directory of the module.