What does the error "Fatal error: Call to undefined function: datum_ge()" in PHP mean?

The error "Fatal error: Call to undefined function: datum_ge()" in PHP means that the function datum_ge() is not defined or included in the code. To solve this issue, you need to define or include the function datum_ge() in your PHP code.

// Define the function datum_ge() if it's missing
if (!function_exists('datum_ge')) {
    function datum_ge() {
        // Function logic here
    }
}