Doctrine\ORM\Query\Parser::AliasIdentificationVariable PHP Method

    public function AliasIdentificationVariable()
    {
        $this->match(Lexer::T_IDENTIFIER);

        $aliasIdentVariable = $this->_lexer->token['value'];
        $exists = isset($this->_queryComponents[$aliasIdentVariable]);

        if ($exists) {
            $this->semanticalError(
                "'$aliasIdentVariable' is already defined.", $this->_lexer->token
            );
        }

        return $aliasIdentVariable;
    }