LdapTools\Query\Operator\MatchingRule::toLdapFilter PHP Method

    public function toLdapFilter($alias = null)
    {
        if ($this->skipFilterForAlias($alias)) {
            return '';
        }
        if (!LdapUtilities::isValidAttributeFormat($this->oid)) {
            throw new LdapQueryException(sprintf('Matching rule "%s" is not a valid format.', $this->oid));
        }
        if ($this->getValueForQuery($alias) instanceof BaseOperator) {
            return $this->getValueForQuery($alias)->toLdapFilter($alias);
        }
        return self::SEPARATOR_START . $this->getAttributeToQuery($alias) . ':' . $this->oid . ':' . $this->operatorSymbol . LdapUtilities::escapeValue($this->getValueForQuery($alias), null, LDAP_ESCAPE_FILTER) . self::SEPARATOR_END;
    }