What are some potential pitfalls of using sleep() for time delays in PHP?

Using sleep() for time delays in PHP can potentially slow down the execution of your script, as it pauses the entire script for the specified amount of time. This can lead to inefficiencies, especially if the delay is longer than necessary. To avoid this issue, you can use the usleep() function instead, which allows for microsecond delays without pausing the entire script.

// Using usleep() for more precise time delays
$delay = 1000000; // 1 second in microseconds
usleep($delay);