src/Bundle/Common/Bag/ValueBag.php
public function fetchEscape(string $key, \mysqli $db, string $default = ''): string
    {
        return $db->real_escape_string($this->fetch($key, $default));
    }
public function fetchEscape(string $key, \mysqli $db, string $default = ''): string
    {
        return $db->real_escape_string($this->fetch($key, $default));
    }
public function fetchEscape ( string $ key , \ mysqli $ db , string $ default = '' ) : string { return $ db -> real_escape_string ( $ this -> fetch ( $ key , $ default ) ) ; }
Use mysql escape function.

@param $key
@param \mysqli $db
@param string $default

@return string
Use mysql escape function .