What are the benefits of sending form data to the same PHP script for validation instead of a separate file?

Sending form data to the same PHP script for validation can simplify the validation process by keeping all the logic in one place. It also allows for easier error handling and displaying error messages directly on the form. Additionally, it reduces the need for additional HTTP requests, improving performance. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Validate form data
    $name = $_POST["name"];
    $email = $_POST["email"];

    $errors = [];

    if (empty($name)) {
        $errors[] = "Name is required";
    }

    if (empty($email) || !filter_var($email, FILTER_VALIDATE_EMAIL)) {
        $errors[] = "Valid email is required";
    }

    // If there are no errors, process the form data
    if (empty($errors)) {
        // Process the form data
    } else {
        // Display errors
        foreach ($errors as $error) {
            echo $error . "<br>";
        }
    }
}
?>

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
    <input type="text" name="name" placeholder="Name">
    <input type="email" name="email" placeholder="Email">
    <button type="submit">Submit</button>
</form>

Keywords

form data PHP script validation benefits separate file

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