Are there any common pitfalls to avoid when implementing a back button feature in PHP forms?

One common pitfall when implementing a back button feature in PHP forms is not properly handling form resubmission when the user navigates back to the form page. To avoid this issue, you can use a POST/Redirect/GET pattern where after form submission, you redirect the user to a new page which prevents the form resubmission when the user hits the back button. 

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

Keywords

PHP forms back button session management form submission

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