USLEEP(3) 1 USLEEP(3)usleep - Delay execution in microsecondsSYNOPSIS
void usleep (int $micro_seconds)
DESCRIPTION
Delays program execution for the given number of microseconds.
PARAMETERS
o $micro_seconds
- Halt time in microseconds. A microsecond is one millionth of a second.
RETURN VALUES
No value is returned.
EXAMPLES
Example #1
usleep(3) example
<?php
// Current time
echo date('h:i:s') . "
";
// wait for 2 seconds
usleep(2000000);
// back!
echo date('h:i:s') . "
";
?>
The above example will output:
11:13:28
11:13:30
SEE ALSO sleep(3), time_nanosleep(3), time_sleep_until(3), set_time_limit(3).
PHP Documentation Group USLEEP(3)
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SLEEP(3) 1 SLEEP(3)sleep - Delay executionSYNOPSIS
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)