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# usleep

(PHP 3, PHP 4 , PHP 5)

usleep -- Delay execution in microseconds

## Description

void usleep ( int micro_seconds)

The usleep() function delays program execution for the given number of micro_seconds. A microsecond is one millionth of a second.

示範 1.usleep() example

`<?php // Current time echo date('h:i:s') . "\n"; // wait for 2 secondes usleep(2000000); // back! echo date('h:i:s') . "\n"; ?>`

This script will output :

    11:13:28
    11:13:30

> 備注: This function did not work on Windows systems until PHP 5.0.0

See also sleep() and set_time_limit().

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