Difference Between Sleep() and Usleep() function in PHP

In PHP, you can delay execution using the sleep() or usleep() functions.

These are the main differences between sleep and usleep functions

Sleep:

1. Takes time in seconds.
2. Less precise because it works in whole seconds.
3. Accepts integer values as the number of seconds.
4. Primarily used for longer delays (whole seconds).
5. Minimum delay is 1 second.

Usleep:

1. Takes time in microseconds (1 second = 1,000,000 microseconds).
2. More precise because it can delay execution for a fraction of a second (down to microsecond precision).
3.  Accepts integer values as the number of microseconds.
4. Minimum delay is 1 microsecond (0.000001 seconds).
5. Used for shorter, finer delays (fractions of a second).