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# time_nanosleep

(PHP 5)

time_nanosleep -- Delay for a number of seconds and nanoseconds

## Description

mixed time_nanosleep ( int seconds, int nanoseconds )

Delays program execution for the given number of seconds and nanoseconds.

seconds must be a positive integer, and nanoseconds must be a positive integer less than 1 billion.

## Return Values

成功回傳`TRUE`失敗回傳`FALSE`。

If the delay was interrupted by a signal, an associative array will be returned with the components:

- seconds - number of seconds remaining in the delay

- nanoseconds - number of nanoseconds remaining in the delay

## 參考

sleep(), usleep(), set_time_limit()

## 範例

範例 1. time_nanosleep() example

`<?php
// Careful! This won't work as expected if an array is returned
if (time_nanosleep(0, 500000000)) {
echo "Slept for half a second.\n";
}
// This is better:
if (time_nanosleep(0, 500000000) === true) {
echo "Slept for half a second.\n";
}
// And this is the best:
$nano = time_nanosleep(2, 100000);
if ($nano === true) {
echo "Slept for 2 seconds, 100 milliseconds.\n";
} elseif ($nano === false) {
echo "Sleeping failed.\n";
} elseif (is_array($nano)) {
$seconds = $nano['seconds'];
$nanoseconds = $nano['nanoseconds'];
echo "Interrupted by a signal.\n";
echo "Time remaining: $seconds seconds, $nanoseconds nanoseconds.";
}
?>`

> 注: 此函數不適用於 Windows 平台。

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