What are the potential pitfalls of using isset() versus !empty() when checking form inputs in PHP?

The potential pitfall of using isset() versus !empty() when checking form inputs in PHP is that isset() only checks if a variable is set and not null, while !empty() also checks if the variable has a non-empty value (e.g., not an empty string, zero, false, or null). To ensure that form inputs are properly validated, it is recommended to use !empty() to check for both existence and non-emptiness of the input.

// Using !empty() to check form inputs
if (!empty($_POST['input_name'])) {
    // Process the input data
} else {
    // Handle the case where the input is empty
}