What are the advantages of using error handlers and header redirects in PHP form validation processes?

When validating forms in PHP, it is essential to use error handlers to catch any validation errors and inform the user of what went wrong. Additionally, using header redirects after form submission helps prevent resubmission of the form data when the user refreshes the page, ensuring a better user experience. 

<?php
// Validate form data
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Check form fields
    if (empty($_POST["username"])) {
        $error = "Username is required";
    }

    // Handle errors
    if (isset($error)) {
        // Display error message
        echo $error;
    } else {
        // Process form data
        // Redirect to a success page
        header("Location: success.php");
        exit();
    }
}
?>

Keywords

error handlers header redirects PHP form validation advantages

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