How can server-side validation be implemented to prevent receiving false data from forms in PHP?

Server-side validation can be implemented in PHP by checking the submitted form data for any discrepancies or invalid entries before processing it. This can be done by using conditional statements and regular expressions to validate input fields such as email addresses, phone numbers, and passwords. By validating the data on the server side, it helps prevent receiving false or malicious data from forms.

// Example of server-side validation in PHP
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $email = $_POST["email"];
    
    // Validate email address
    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
        $error = "Invalid email format";
    } else {
        // Process the form data
    }
}