What are the best practices for implementing PHP code to handle user selections and interactions in a visual tool like the one described?

Issue: When handling user selections and interactions in a visual tool, it is important to properly sanitize and validate user input to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. Additionally, using a structured approach to manage user selections and interactions can help improve code readability and maintainability. PHP Code Snippet: 

// Sanitize and validate user input
$user_input = isset($_POST['user_input']) ? htmlspecialchars($_POST['user_input']) : '';

// Handle user selections and interactions
if ($user_input === 'option1') {
    // Perform actions for option 1
} elseif ($user_input === 'option2') {
    // Perform actions for option 2
} else {
    // Handle invalid user input
    echo 'Invalid selection';
}

Keywords

PHP user selections interactions visual tool implementation error handling

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