PHP usleep() Function

PHP Misc Reference PHP Misc Reference

Example

Delay execution of the current script for 5 seconds (5000000 microseconds):

<?php
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 for a specified number of microseconds (a microsecond equals one millionth of a second).

Note: This function throws an error if the specified number of seconds is negative.


Syntax

usleep(microseconds)

Parameter Description
microseconds Required. Specifies the number of microseconds to delay the script

Technical Details

Return Value: No value is returned
PHP Version: 4+
Changelog: This function did not work on Windows platforms until PHP 5

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