What is the best practice for ensuring that form values do not reset to default after submission in PHP?

To ensure that form values do not reset to default after submission in PHP, you can use PHP to populate the form fields with the submitted values if the form has been submitted. This can be achieved by checking if the form has been submitted and then using the $_POST superglobal array to retrieve the submitted values and populate the form fields accordingly. 

<?php
// Check if the form has been submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Retrieve the submitted values from the form
    $name = $_POST['name'];
    $email = $_POST['email'];
    $message = $_POST['message'];
} else {
    // Set default values for the form fields
    $name = "";
    $email = "";
    $message = "";
}
?>

<form method="post" action="">
    <input type="text" name="name" value="<?php echo $name; ?>" placeholder="Name">
    <input type="email" name="email" value="<?php echo $email; ?>" placeholder="Email">
    <textarea name="message" placeholder="Message"><?php echo $message; ?></textarea>
    <button type="submit">Submit</button>
</form>

Keywords

PHP form submission form values session variables data persistence

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