PHP usleep()Functions
PHP Misc Reference ManualExamples
Delay execution of the current script by 5 seconds (5000000 microseconds):
echo date('h:i:s') . "<br>";
//sleep for 5 seconds
usleep(5000000);
//start again
echo date('h:i:s');
Run Example »
Definition and Usage
The usleep() function delays execution of the current script by a number of microseconds (one microsecond equals one millionth of a second).
Note:If the specified number of seconds is negative, the function will throw an error.
Syntax
usleep(microseconds)
| Parameters | Description |
|---|---|
| microseconds | Required. Specifies the number of microseconds to delay the script execution. |
Technical Details
| Return value: | No return value. |
|---|---|
| PHP Version: | 4+ |
| Changelog: | This function was not implemented on Windows platforms until PHP 5. |
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