How can PHP scripts retain user input data in form fields after validation errors occur, to prevent re-entering all information?

To retain user input data in form fields after validation errors occur, you can store the submitted data in PHP variables and then use these variables to populate the form fields when the page reloads after validation. This can be achieved by checking if the form has been submitted and if there are any validation errors, and then setting the value attribute of each form field to the corresponding PHP variable. 

<?php
// Initialize variables to store user input data
$name = '';
$email = '';
$message = '';

// Check if form has been submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Retrieve user input data from form submission
    $name = $_POST['name'];
    $email = $_POST['email'];
    $message = $_POST['message'];

    // Validate user input data
    // If validation fails, display error messages and retain user input data in form fields
}

?>

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
    <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 validation user input data retention error handling

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