What are the potential pitfalls of relying on JavaScript for automated processes in a PHP application?

One potential pitfall of relying on JavaScript for automated processes in a PHP application is that JavaScript can be disabled or not supported by some users, leading to unreliable functionality. To mitigate this issue, it's important to have server-side validation and processing in PHP to ensure that critical automated processes are not solely dependent on client-side JavaScript.

// PHP server-side validation and processing example
if(isset($_POST['submit'])){
    // Perform necessary validation and processing here
    $inputValue = $_POST['input_value'];
    
    // Example: Check if input value is not empty
    if(empty($inputValue)){
        echo "Input value cannot be empty";
    } else {
        // Process the input value
        // Your code here
    }
}