What could be causing the empty() function to not work as expected in PHP when checking for empty fields?

The issue could be due to the fact that the empty() function in PHP considers variables that are set to '0' or '0.0' as empty, which may not be the desired behavior when checking for empty fields. To solve this issue, you can use the isset() function along with empty() to check if a variable is set and not empty.

// Check if the field is set and not empty
if (isset($_POST['field_name']) && !empty($_POST['field_name'])) {
    // Field is not empty
    $field_value = $_POST['field_name'];
} else {
    // Field is empty
    echo "Field is empty";
}