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

Relying solely on JavaScript for form validation in PHP applications can be risky because it can easily be bypassed by users who disable JavaScript in their browsers or manipulate the client-side code. To ensure secure form validation, it is important to also perform validation on the server-side using PHP. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST["name"];
    
    // Server-side validation
    if (empty($name)) {
        $errors[] = "Name is required";
    }
    
    if (!empty($errors)) {
        foreach ($errors as $error) {
            echo $error . "<br>";
        }
    } else {
        // Process form data
    }
}
?>

Keywords

JavaScript form validation PHP applications server-side validation security vulnerabilities

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