PHP sleep() Function

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# PHP sleep() Function

PHP Misc Reference

## Example

Delay execution of the current script for 5 seconds:

<?php
echo date('h:i:s') . "<br>";
//sleep for 5 seconds
sleep(5);
//start again
echo date('h:i:s');
?>
Run example »

## 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 | 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.

PHP Misc Reference

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