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- random([seed])
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- seed
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- return
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non-negative integer
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Generates a random number which is a non-negative integer less than 2^32.
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If a non zero argument is specified, then after setting it as a random seed,
a random number is generated.
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As the default seed is fixed, the sequence of the random numbers is
always the same if a seed is not set.
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The algorithm is Mersenne Twister
(http://www.math.keio.ac.jp/matsumoto/mt.html) by M. Matsumoto and
T. Nishimura. The implementation is done also by themselves.
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The period of the random number sequence is 2^19937-1.
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One can save the state of the random number generator with
mt_save.
By loading the state file with mt_load,
one can trace a single random number sequence arcoss multiple sessions.
- References
-
section
lrandom, section mt_save, mt_load.
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