How can the issue of server-side PHP code execution after form submission be addressed when using JavaScript for client-side validation?

Issue: The issue of server-side PHP code execution after form submission can be addressed by implementing proper server-side validation in addition to client-side validation using JavaScript. This ensures that even if a user bypasses the client-side validation, the server will still validate the input and prevent any malicious PHP code execution. 

// Server-side validation code snippet
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $input_data = $_POST['input_data'];
    
    // Validate input data
    if (/* add your validation logic here */) {
        // Process the form data
    } else {
        // Display error message to the user
    }
}

Keywords

PHP JavaScript server-side client-side validation

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