Function to get the generation page time

today i got very nice php function from jooria
its give you the generation page time
the function:

function gen_time() {
    static $time;
        if($time== 0){
            $time= microtime(true);
        }else{
            return (string)(microtime(true)-$time);
        }
}

how you can use:

gentime();

# your source code here

echo 'Generated in '.gentime().' seconds.'

the snippet