What strategies can be implemented to ensure the proper execution of PHP switch case statements when dealing with user input?

When dealing with user input in PHP switch case statements, it's important to sanitize and validate the input to prevent unexpected behavior or vulnerabilities. One way to ensure proper execution is to use a combination of input validation functions and a default case to handle unexpected input gracefully. 

$user_input = $_POST['user_input'];

// Sanitize and validate user input
if (is_numeric($user_input)) {
    switch ($user_input) {
        case 1:
            // Code for case 1
            break;
        case 2:
            // Code for case 2
            break;
        default:
            // Default case for unexpected input
            break;
    }
} else {
    // Handle invalid input
    echo "Invalid input. Please enter a numeric value.";
}

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