php 한글 메뉴얼 도움말 검색 사이트 Delay execution [function.sleep]

설명

int sleep ( int $seconds )

Delays the program execution for the given number of seconds.

인수

seconds: Halt time in seconds.

반환값

Returns zero on success, or FALSE on error.

If the call was interrupted by a signal, sleep() returns a non-zero value. On Windows, this value will always be 192 (the value of the WAIT_IO_COMPLETION constant within the Windows API). On other platforms, the return value will be the number of seconds left to sleep.

오류/예외

If the specified number of seconds is negative, this function will generate a E_WARNING.

변경점

버전	설명
5.3.4	Before PHP 5.3.4, on Windows, sleep() always returns `NULL` when sleep has occurred, regardless of whether the sleep was interrupted or not.

예제

Example #1 sleep() example


<?php

// current time
echo date('h:i:s') . "\n";

// sleep for 10 seconds
sleep(10);

// wake up !
echo date('h:i:s') . "\n";

?>

This example will output (after 10 seconds)

05:31:23
05:31:33

참고

usleep() - Delay execution in microseconds
time_nanosleep() - Delay for a number of seconds and nanoseconds
time_sleep_until() - Make the script sleep until the specified time
set_time_limit() - 최대 실행 시간을 제한