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# time_sleep_until

(PHP 5 >= 5.1.0RC1)

time_sleep_until -- Make the script sleep until the specified time

## 说明

bool time_sleep_until ( float timestamp )

This function will make the script sleep until the specified timestamp. If the specified timestamp is in the past, time_sleep_until() will generate a `E_WARNING` and return `FALSE`.

> 注: 本函数未在 Windows 平台下实现。

## 参数

timestamp

  The timestamp when the script should wake.

## 返回值

如果成功则返回 `TRUE`，失败则返回 `FALSE`。

## 范例

例子 1. A time_sleep_until() example

`<?php //returns false and generates a warning var_dump(time_sleep_until(time()-1)); // may only work on faster computers, will sleep up to 0.2 seconds var_dump(time_sleep_until(time()+0.2)); ?>`

## 参见

sleep()
usleep()
time_nanosleep()

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