从减去两次获得十进制数量

Question

How do I subtract two time variables from each other with the answer as a decimal number? My time variables look like this: 07:32:00

I am looking for something like this:

$total = $start_time - $end_time
echo "$time Hours";

Output to look like this:

5.3 Hours

Answer 1

You cant subtract on strings. Your variable "07:32:00" is a string.

You will have to convert the time to Unix timestamp with the php function strtotime.

And you aslo have to subtract from the largest time.

Here is the solution:

echo (strtotime("15:00:00") - strtotime("11:30:00"))/(60*60);