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PhpDig is a PHP MySQL based
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usleep — Delays program execution.


void usleep(microseconds);
integer microseconds: Number of microseconds to sleep




usleep() is used to delay the execution of the current program. The delay lasts for the number of microseconds specified in the microseconds argument and begins at the point in the script where the usleep() function call is made.


usleep() does not work on some operating systems (notably most Windows family operating systems).


PHP Version: 3+, 4+

See also

To sleep for a number of seconds:



Example 762. Use usleep() to reduce the effectiveness of lottery-style password attacks

# Sleep for 1/2 second
microsleep (500);

# Attempt to authenticate user data
# ...

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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