# usleep

(PHP 4, PHP 5, PHP 7)

usleep — Delay execution in microseconds

### Description

usleep ( int `$micro_seconds` ) : void

Delays program execution for the given number of microseconds.

### Parameters

`micro_seconds`

  Halt time in microseconds. A microsecond is one millionth of a second.

  > Note: On Windows, the system may sleep longer that the given number of microseconds, depending on the hardware.

### 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