How can PHP beginners ensure their form data is valid and correctly submitted to another page?

PHP beginners can ensure their form data is valid and correctly submitted to another page by using server-side validation to check for any errors or missing fields before processing the form data. This can be done by checking each form field individually and displaying error messages if necessary. Additionally, using PHP's built-in functions like `filter_var()` or regular expressions can help validate specific types of data, such as email addresses or phone numbers. 

<?php
// Check if the form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Validate form data
    $name = $_POST["name"];
    $email = $_POST["email"];
    
    // Check if name is not empty
    if (empty($name)) {
        $errors[] = "Name is required";
    }
    
    // Check if email is valid
    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
        $errors[] = "Email is not valid";
    }
    
    // If no errors, process form data
    if (empty($errors)) {
        // Process form data, e.g. save to database
        header("Location: another-page.php");
        exit();
    }
}
?>

Keywords

form validation PHP data submission error handling input sanitization

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