JEMBOT MAWOT Bypass Shell

<?php

namespace DoctrineExtensions\Query\Mysql;

use Doctrine\ORM\Query\AST\Functions\FunctionNode;
use Doctrine\ORM\Query\AST\Node;
use Doctrine\ORM\Query\Lexer;
use Doctrine\ORM\Query\Parser;
use Doctrine\ORM\Query\QueryException;
use Doctrine\ORM\Query\SqlWalker;

class IsIpv4Mapped extends FunctionNode
{
    public $valueExpression = null;

    /**
     * @param Parser $parser
     *
     * @throws QueryException
     */
    public function parse(Parser $parser)
    {
        $parser->match(Lexer::T_IDENTIFIER);
        $parser->match(Lexer::T_OPEN_PARENTHESIS);
        $this->valueExpression = $parser->StringPrimary();
        $parser->match(Lexer::T_CLOSE_PARENTHESIS);
    }

    /**
     * @param SqlWalker $sqlWalker
     *
     * @return string
     */
    public function getSql(SqlWalker $sqlWalker)
    {
        return 'IS_IPV4_MAPPED('
            . (
                $this->valueExpression instanceof Node
                ? $this->valueExpression->dispatch($sqlWalker)
                : "'" . $this->valueExpression . "'"
            )
            .')';
    }
}