[OpenSIPS-Users] variable compare string

[Satish Patel]

I have following SQL query

 avp_db_query("SELECT billing_customer,route_info FROM inbound WHERE
(did='$tU')","$avp(bparty);$avp(route_info)");

I want to check if $avp(route_info)   has NULL entry in DB table, But
following code always giving me true. Even DB has value. what is wrong with
code?

 if ($avp(route_info) = NULL) {
        xlog("Route_info is NULL");
}
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