undefined index in php page

Question

I am getting error message :

undefined index:

in my code. Below is the function on the line

if($user['flagged'] == 1){ $flag = "Your last payment has been flagged as NOT RECEIVED."; } it says Undefined index: flagged

How can this be fixed

Answer 1

Just check if msg index of global array $_GET is set. For example

if(isset($_GET['msg']) && $_GET['msg']==="success")

I think it will solve your problem.

Answer 2

use isset() to check it first

if(isset($_GET['msg']) && $_GET['msg']==="success"){
    $log_prompt = '<span style="color:red">You Have successfully registered. Login Now!</span>';
}

if the first condition isset($_GET['msg']) returned false, it will escape the second part of the if condition and will not print your message.

read more about Logical Operators

Answer 3

When you load the page the URL must me something like this:

localhost/your_page.php?msg=something_value

But your app mustn't return error when in URL there isn't ?msg=value... You have to use isset()

if(isset($_GET['msg']) && $_GET['msg'] == "success")

=== is recommended

if(isset($_GET['msg']) && $_GET['msg'] === "success")

More info: http://php.net/manual/en/language.operators.logical.php