(PHP 4, PHP 5, PHP 7, PHP 8)
sleep — Delay execution
Delays the program execution for the given number of
seconds.
Note:
In order to delay program execution for a fraction of a second, use usleep() as the sleep() function expects an int. For example,
sleep(0.25)will pause program execution for0seconds.
seconds
Halt time in seconds (must be greater than or equal to 0).
Returns zero on success.
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.
If the specified number of seconds is negative,
this function will throw a ValueError.
| Version | Description |
|---|---|
| 8.0.0 |
The function throws a ValueError on negative seconds;
previously, an E_WARNING was raised instead, and the function returned false.
|
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