What other PHP functions or methods could be used to achieve the same countdown functionality more efficiently?

The issue with the current implementation of the countdown functionality is that it uses a loop to decrement the countdown variable, which may not be the most efficient way to achieve this. A more efficient approach would be to use the `sleep()` function along with a `for` loop to create a countdown timer. 

for ($i = 10; $i > 0; $i--) {
    echo $i . "<br>";
    sleep(1);
}
echo "Blast off!";

Keywords

date_diff date_create strtotime DateTime interval

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