What are the potential pitfalls of relying solely on client-side JavaScript for form validation in PHP?

Relying solely on client-side JavaScript for form validation in PHP can be risky because client-side validation can be bypassed by users who disable JavaScript or manipulate the code. To ensure data integrity, it's essential to perform server-side validation in PHP as well. This can be done by re-validating the form data on the server side before processing it. 

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

Keywords

client-side JavaScript form validation PHP server-side validation security vulnerabilities

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