sleep
(PHP 4, PHP 5, PHP 7)
sleep — Delay execution
Description
int sleep ( int $seconds ) Delays the program execution for the given number of seconds.
Parameters
seconds
Halt time in seconds.
Return Values
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.
Errors/Exceptions
If the specified number of seconds is negative, this function will generate a E_WARNING.
Changelog
Version | Description |
|---|---|
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. |
Examples
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
05:31:33See Also
- 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() - Limits the maximum execution time
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sys_getloadavg →
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