The reason why your code isn't working
You are attempting to use a variable, $info
, that has not been defined. When you attempt to use an undefined variable, you're effectively concatenating nothing into a string, however because PHP is loosely typed, it declares the variable the second you reference it. That is why you're seeing a notice
and not a fatal error
. You should go through your code, and ensure that $info
gets a value assigned to it, and that it is not overwritten at some point by another function. However, more importantly, read below.
Stop what you are doing
This is vulnerable to a type of attack called an SQL Injection. I'm not going to tell you how to concatenate SQL strings. It's terrible practice.
You should NOT be using mysql functions in PHP. They are deprecated. Instead use the PHP PDO Object, with prepared statements. Here's a rather good tutorial.
Example
After you've read this tutorial, you'll be able to make a PDO Object, so I'll leave that bit for you.
The next stage is to add your query, using the prepare
method:
$PDO->prepare("SELECT * FROM tbl WHERE `id` = :id");
// Loads up the SQL statement. Notice the :id bit.
$actualID = "this is an ID";
$PDO->bindParam(':id', $actualID);
// Bind the value to the parameter in the SQL String.
$PDO->execute();
// This will run the SQL Query for you.