The upper-bound of this value is platform-independent. PHP implements the 32-bit version of the Mersenne Twister ("mt"), so the maximum possible value is 2**31 - 1 (2147483647).
mt_getrandmax
(PHP 4, PHP 5)
mt_getrandmax — Show largest possible random value
Beskrivelse
int mt_getrandmax
( void
)
Returns the maximum value that can be returned by a call to mt_rand().
Returnerings Værdier
Returns the maximum random value returned by mt_rand()
Eksempler
Eksempel #1 Calculate a random floating-point number
<?php
function randomFloat($min = 0, $max = 1) {
return $min + mt_rand() / mt_getrandmax() * ($max - $min);
}
var_dump(randomFloat());
var_dump(randomFloat(2, 20));
?>
The above example will output something similar to:
float(0.91601131712832) float(16.511210331931)
Se også
- mt_rand() - Generate a better random value
- mt_srand() - Seed the better random number generator
- getrandmax() - Show largest possible random value
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User Contributed Notes 1 note
bishop at php dot net ¶
8 years ago
