What are common pitfalls when using PHP for form submission, especially in handling form visibility after successful submission?

One common pitfall when using PHP for form submission is not properly handling the visibility of the form after a successful submission. To address this, you can use a conditional statement to check if the form has been submitted and then hide the form accordingly using CSS. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Process form submission
    // Show success message
} else {
    // Show form
}
?>
<!DOCTYPE html>
<html>
<head>
    <style>
        .hidden {
            display: none;
        }
    </style>
</head>
<body>
    <div <?php if ($_SERVER["REQUEST_METHOD"] == "POST") { echo 'class="hidden"'; } ?>>
        <form method="post" action="<?php echo $_SERVER["PHP_SELF"]; ?>">
            <!-- Form fields go here -->
            <input type="submit" value="Submit">
        </form>
    </div>
    <?php if ($_SERVER["REQUEST_METHOD"] == "POST") { echo "Form submitted successfully!"; } ?>
</body>
</html>

Keywords

PHP form submission form handling visibility error handling

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