Odd issue with php funtions

[betaits]

So basically I am very new to programming but have learned my way to a point where I have a system where if you purchase multiple online accounts on the site it will not only create a newly registered user but as many users as online accounts where created.

 

I found many security issues so I have since begun the transition to what will be an extension. I found a tutorial that would do basically exactly what I needed, I would just need to add some functions and so on.

 

Everything worked great, as a test I inserted spql queries and functions to the demo code to display a table of results. All worked fine.

 

The issue is that now I have created som new functions - basically the same as the ones that work - and if I try to call them I get a blank screen.

 

 

(Normally I go to url and it shows page in template of site with some testing echos, once I try and use my most recent functions I got a blank screen but with the echos appearing that where done before the function call.

 

Here is the function in DAL.php and the function call from a different php file.

 

public function get_last_user_created($username){

 

$sql = "SELECT * FROM ty2ox_users WHERE username = '$username'";

 

 

return $this->query($sql);

}

 

 

 

 

$lastuser = $dal->get_last_user_created($username);

 

 

Please help as this does not make any sense to me. Also any tips on making the code cleaner or better would be greatly appreciated.

postpayment.php

DAL.php