08-24-2011
Quote:
Originally Posted by
yazu
I've never heard about builtin sleep. It's just not GNU sleep (BSD on Mac, or something else). The variant with perl is the best solution (on modern enough boxes).
ksh93 does indeed have a built-in sleep.
GNU sleep is not special in this regard. I regularly use *BSD and every BSD's sleep(1) supports fractions of a second.
Regards,
Alister
This User Gave Thanks to alister For This Post:
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SLEEP(3) 1 SLEEP(3)
sleep - Delay execution
SYNOPSIS
int sleep (int $seconds)
DESCRIPTION
Delays the program execution for the given number of $seconds.
PARAMETERS
o $seconds
- Halt time in seconds.
RETURN VALUES
Returns zero on success, or FALSE on error.
If the call was interrupted by a signal, sleep(3) 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(3) always |
| | returns NULL when sleep has occurred, regardless |
| | of whether the sleep was interrupted or not. |
| | |
+--------+---------------------------------------------------+
EXAMPLES
Example #1
sleep(3) example
<?php
// current time
echo date('h:i:s') . "
";
// sleep for 10 seconds
sleep(10);
// wake up !
echo date('h:i:s') . "
";
?>
This example will output (after 10 seconds)
05:31:23
05:31:33
SEE ALSO
usleep(3), time_nanosleep(3), time_sleep_until(3), set_time_limit(3).
PHP Documentation Group SLEEP(3)