August 2000
Intermediate to advanced
800 pages
13h 15m
English
Content preview from Core PHP Programming: Using PHP to Build Dynamic Web SitesBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Random Numbers
The following functions help you generate pseudorandom numbers. There are wrappers for the randomizing functions offered by your operating system, and there are functions based on the Mersenne Twister algorithm. The Mersenne Twister functions are faster and return numbers with a much better distribution suitable for cryptographic applications. The algorithm was developed by Makoto Matsumoto and Takuji Nishimura. You can read more about it on their Web page http://www.math.keio.ac.jp/~matumoto/emt. html. Pedro Melo refactored an implementation by Shawn Cokus in order to add support to PHP.
integer getrandmax()
The getrandmax function returns the maximum random number that may be returned by the rand function.
<? print(getrandmax()); ...
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