ZF2 mysql query with interval - php

Question

In my application I want to print a list with members who where online the last 5 minutes.
I tried to create this by mysql interval with the code below;
$interval = 5;
$select->where(array('member_last_online > ?' => 'SUBDATE(NOW(), INTERVAL '.$interval.' MINUTE)'));
Which produce this notice;
Notice: Attempting to quote a value without specific driver level support can introduce security vulnerabilities in a production environment. in ..zf_path..
The output from 'getSqlSTring()' is;
SELECT "members".* FROM "members" WHERE member_last_online > 'SUBDATE(NOW(), INTERVAL 5 MINUTE)'
If I execute the query below directly on the table it returns the data as accepted:
SELECT members.* FROM members WHERE member_last_online > SUBDATE(NOW(), INTERVAL 5 MINUTE)
What am I do wrong here?

Answer 1

You need to pass the db platform to getSqlString() to avoid the warning (so it knows how to quote values):
// assuming $db is the DB adapter instance
echo $select->getSqlString($db->getPlatform());
the solution to your main question is:
$select->where(new \Zend\Db\Sql\Predicate\Expression('SUBDATE(NOW(), INTERVAL '.$interval.' MINUTE)'));
or more readably:
use Zend\Db\Sql\Predicate\Expression;
$select->where(new Expression('SUBDATE(NOW(), INTERVAL '.$interval.' MINUTE)'));