What are the potential risks of relying solely on client-side validation in PHP web development?

Relying solely on client-side validation in PHP web development can be risky because it can easily be bypassed by users who disable JavaScript or manipulate the front-end code. To mitigate this risk, it is important to implement server-side validation as well to ensure that data is validated on the server before processing. 

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST["username"];
    $password = $_POST["password"];
    
    // Server-side validation
    if (empty($username) || empty($password)) {
        echo "Please fill in all fields.";
    } else {
        // Process the data
    }
}

Keywords

client-side validation PHP web development security vulnerabilities server-side validation data integrity

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