usleep
(PHP 4, PHP 5, PHP 7, PHP 8)
usleep — Delay execution in microseconds
Description
usleep(int
$microseconds): voidDelays program execution for the given number of microseconds.
Parameters
-
microseconds -
Halt time in microseconds. A microsecond is one millionth of a second.
Note: Values larger than
1000000(i.e. sleeping for more than a second) may not be supported by the operating system. Use sleep() instead.Note: The sleep may be lengthened slightly (i.e. may be longer than
microseconds) by any system activity or by the time spent processing the call or by the granularity of system timers.
Return Values
No value is returned.
Examples
Example #1 usleep() example
<?php
// Current time
echo date('h:i:s') . "\n";
// wait for 2 seconds
usleep(2000000);
// back!
echo date('h:i:s') . "\n";
?>
The above example will output:
11:13:28 11:13:30
See Also
- sleep() - Delay execution
- time_nanosleep() - Delay for a number of seconds and nanoseconds
- time_sleep_until() - Make the script sleep until the specified time
- set_time_limit() - Limits the maximum execution time
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