public function getScriptFile()
    {
        if (isset($this->_scriptFile)) {
            return $this->_scriptFile;
        }

        if (isset($_SERVER['SCRIPT_FILENAME'])) {
            return $_SERVER['SCRIPT_FILENAME'];
        }

        throw new InvalidConfigException('Unable to determine the entry script file path.');
    }
public function getScriptFile()
    {
        if (isset($this->_scriptFile)) {
            return $this->_scriptFile;
        }

        if (isset($_SERVER['SCRIPT_FILENAME'])) {
            return $_SERVER['SCRIPT_FILENAME'];
        }

        throw new InvalidConfigException('Unable to determine the entry script file path.');
    }
Returns the entry script file path.
The default implementation will simply return `$_SERVER['SCRIPT_FILENAME']`.
@return string the entry script file path
@throws InvalidConfigException