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mt_srand — Seeds the random number generator for mt_rand() .


void mt_srand(seed);
int seed: Seed number for the random number generator




This function seeds the random number generator for mt_rand() . The greater the randomness of the initial seed passed to this function, the better the randomness of the numbers later generated by mt_rand() .

This function needs to be called only once per script, before any calls to mt_rand() .


PHP 3 since 3.0.6, PHP 4


Example 683. Seed the Mersenne Twister random number generator

mt_srand((double) microtime() * 1000000);

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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