What are the best practices for handling browser history and form submissions in PHP applications?

When handling browser history and form submissions in PHP applications, it is important to prevent resubmission of forms when the user refreshes the page or navigates back and forth. One way to achieve this is by using the Post/Redirect/Get (PRG) pattern, where form submissions are processed using POST requests, then redirecting to a new page to prevent resubmission when the user refreshes the page. 

```php
// Check if form is submitted
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    // Process form data
    // Redirect to a new page to prevent resubmission
    header("Location: success.php");
    exit();
}
```

In this code snippet, we first check if the form is submitted using the `$_SERVER['REQUEST_METHOD']` variable. If the form is submitted, we process the form data and then redirect to a new page using the `header()` function to prevent resubmission when the user refreshes the page. The `exit()` function is used to stop further execution of the script after the redirect.

Keywords

browser history form submissions PHP applications session management CSRF protection

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