What are the best practices for setting the action attribute in a form based on validation results in PHP?

When setting the action attribute in a form based on validation results in PHP, it's important to dynamically adjust the action URL based on whether the form data is valid or not. One way to achieve this is by using conditional statements to set the action attribute to different URLs depending on the validation results. 

<?php
// Check if form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Perform form validation
    $errors = array();
    // Validate form data
    if (/* validation condition */) {
        // Form data is valid, set action to success page
        $action = "success.php";
    } else {
        // Form data is invalid, set action back to the current page
        $action = $_SERVER['PHP_SELF'];
    }
} else {
    // Set default action when form is not submitted
    $action = $_SERVER['PHP_SELF'];
}
?>

<form method="post" action="<?php echo $action; ?>">
    <!-- Form fields go here -->
</form>

Keywords

form action attribute validation results PHP best practices

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