phpHow to measure execution time

$start = time();
# Other code:
sleep(15);
$time = time() - $start;ctrl + cgithub

`$start = time();` assign the current time to a variable called `$start`	`# Other code` the rest of the code to execute
`sleep(15);` wait 15 seconds (for testing purposes)	`$time = time() - $start;` assign the total time since `$start` to a variable called `$time`

$start = time();
sleep(15);
$time = time() - $start;
echo $time . " seconds";

15 seconds