How can the use of the $_POST array be optimized to avoid potential pitfalls like empty arrays?

When using the $_POST array in PHP, it is important to check if the key exists and if it is not empty before using it to avoid potential pitfalls like empty arrays. This can be achieved by using the isset() and !empty() functions to ensure that the value is set and not empty before processing it.

if(isset($_POST['key']) && !empty($_POST['key'])){
    // Process the value of $_POST['key'] here
}