Are there specific PHP functions or comparisons that can help differentiate between empty fields and fields containing "0"?

When working with form data or database records, it's important to differentiate between empty fields and fields containing the value "0". The PHP functions `empty()` and `isset()` can help in this scenario. The `empty()` function will return true for empty fields, including "0", while the `isset()` function will return false for empty fields but true for fields containing "0".

// Example code snippet to differentiate between empty fields and fields containing "0"
$field = ""; // or $field = "0";

if (isset($field)) {
    if ($field === "0") {
        echo "Field contains '0'";
    } else {
        echo "Field is not empty";
    }
} else {
    echo "Field is empty";
}