Microsoft Word - Core PHP Programming Using PHP to Build Dynamic Web Sites

sleep(integer seconds)

The sleep function causes execution to pause for the given number of seconds.

<?
print(microtime());
sleep(3);
print("
\n");
print(microtime());
?>

usleep(integer microseconds)

The usleep function causes execution to pause for the given number of microseconds.
There are a million microseconds in a second.

<?
print(microtime());
usleep(30);
print("
\n");
print(microtime());
?>