Question

I am using php to update a mysql DB within a function. I am able to echo my variable names and was able to return the variables on the php page. This proves to me that my variables are working correctly.

Now when I use the update command, my DB does not respond. Yes, I have connected to the DB and it all works.

This is what I am using to update:

mysql_query("UPDATE `table_name`
            SET `int_field` = '$int_value'
            WHERE `username` = $username");

Answer 1

The value for $username should be wrap with single quotes.

mysql_query(" UPDATE table_name 
                 SET int_field = '$int_value' 
               WHERE username = '$username'");

SideNote: your code is vulnerable with SQL Injection. Please read the article below to know how to secure your code,

Best way to prevent SQL injection in PHP?