What are the potential pitfalls of relying on client-side solutions like JavaScript's "beforeunload" event for handling user logout in PHP applications?

Relying solely on client-side solutions like JavaScript's "beforeunload" event for handling user logout in PHP applications can be risky as it can be bypassed or manipulated by the user. It is important to also implement server-side validation to ensure a secure logout process. 

```php
session_start();

if(isset($_POST['logout'])) {
    // Perform any necessary logout actions
    session_unset();
    session_destroy();
    header("Location: login.php");
    exit;
}
```
In this code snippet, we check if the "logout" POST parameter is set, and if so, we unset and destroy the session before redirecting the user to the login page. This ensures that the logout process is handled securely on the server side.

Keywords

client-side solutions JavaScript beforeunload event user logout PHP applications

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