PHP sleep() Function
Example
Delay execution of the current script for 3 seconds:
<?php
echo date('h:i:s') . "<br>";
//sleep for 3 seconds
sleep(3);
//start again
echo date('h:i:s');
?>
Try it Yourself »
Definition and Usage
The sleep() function delays execution of the current script for a specified number of seconds.
Note: This function throws an error if the specified number of seconds is negative.
Syntax
sleep(seconds)
Parameter Values
| Parameter | Description |
|---|---|
| seconds | Required. Specifies the number of seconds to delay the script |
Technical Details
| Return Value: | Returns 0 on success, or FALSE on error. This function returns a non-zero value if the call was interrupted by a signal. On Windows, this value will always be 192, which is 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. |
|---|---|
| PHP Version: | 4+ |
| Changelog: | Before PHP 5.3.4, this function always returns NULL when sleep has occurred on Windows. |
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