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forms - Cannot assign session variables in php

Hey everyone,

So I've been working on a web project using PHP and I'm having trouble with assigning session variables in my forms. I'm not sure what I'm doing wrong, so I was hoping someone here could help me out.

Here's the code I'm currently working with:


// In my form page

$_SESSION['username'] = $_POST['username'];

After submitting the form, I expected the `$_SESSION['username']` variable to hold the value entered by the user, but it seems to be empty. I've already made sure that the `session_start()` function is called before assigning any session variables.

Am I missing something here? Is there a different way to assign session variables in PHP?

Any help or suggestions would be greatly appreciated. Thanks in advance!

All Replies



I've faced a similar issue with assigning session variables in PHP before, and after some troubleshooting, I found a possible solution. Let's try something a bit different.

Instead of directly assigning the `$_POST['username']` value to the session variable, try using a intermediate variable to sanitize and validate the input. For example:


// In my form page

$username = trim($_POST['username']); // Trim any leading/trailing whitespaces
$username = filter_var($username, FILTER_SANITIZE_STRING); // Sanitize the value

$_SESSION['username'] = $username;

By applying `trim()` and `filter_var()` functions, we ensure that any unwanted characters and whitespace are removed before assigning the value to `$_SESSION['username']`.

Another thing you might want to check is if your session is being destroyed or closed anywhere in your code. Make sure you are not unintentionally ending the session before being able to access the variable.

Lastly, you could also try using `isset()` to check if the `$_POST['username']` value is set before assigning it to the session variable. This would ensure that you only assign a value when there actually is one:


// In my form page

if (isset($_POST['username'])) {
$_SESSION['username'] = $_POST['username'];

I hope this alternative approach helps resolve your issue. Let me know if you need any further assistance or if there's anything else I can do to assist you!


Hey there,

I've encountered a similar issue before, and there are a few things you can check to ensure that session variables are assigned correctly in PHP.

First, make sure that your form has the `method="post"` attribute. This is essential for the `$_POST` variable to capture the form data correctly. Also, ensure that the input field for the username has the correct `name` attribute, like `<input type="text" name="username">`.

Next, check if there are any errors or warnings being thrown by PHP. You can do this by enabling error reporting. Just add the following lines of code at the start of your script, before the `session_start()` call:

ini_set("display_errors", 1);

This will help you identify any syntax or runtime errors that could be preventing the assignment of session variables.

Additionally, ensure that you have not accidentally disabled sessions in your PHP configuration. Open the `php.ini` file and look for the line `session.auto_start`. If it is set to `0`, change it to `1` and restart your web server.

If none of these solutions work, check if you have any other code that might be interfering with the session variables. For example, if you have any code that unsets or modifies the session variable before assigning it, it could cause unexpected behavior.

I hope one of these suggestions resolves your issue. Let me know if you have any further questions or if there's anything else I can assist you with!

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