What are the best practices for handling form submission in PHP to ensure that error messages are displayed only when the form is submitted?

To ensure that error messages are displayed only when the form is submitted, you can check if the form has been submitted using the `$_SERVER['REQUEST_METHOD']` variable. If the form has been submitted, then validate the form data and display error messages accordingly. This way, error messages will only be displayed when the form is submitted. 

<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    // Form validation and error handling
    $errors = array();

    // Check form fields and set errors if necessary

    if (empty($errors)) {
        // Process form data
    } else {
        // Display error messages
        foreach ($errors as $error) {
            echo $error . "<br>";
        }
    }
}
?>

Keywords

form submission error messages validation PHP conditional display

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