public function getDefaultValue(string $variableName)
    {
        if (isset($this->defaultValues[$variableName])) {
            return $this->defaultValues[$variableName];
        }

        return null;
    }
public function getDefaultValue(string $variableName)
    {
        if (isset($this->defaultValues[$variableName])) {
            return $this->defaultValues[$variableName];
        }

        return null;
    }
public function getDefaultValue ( string $ variableName ) { if ( isset ( $ this -> defaultValues [ $ variableName ] ) ) { return $ this -> defaultValues [ $ variableName ] ; } return null ; }
Gets the default value for a variable

@param string $variableName The name of the variable whose default value we want
@return mixed|null The default value for the variable if it exists, otherwise null
Gets the default value for a variable