SunshinePHP Developer Conference 2015

lcg_value

(PHP 4, PHP 5)

lcg_valueCombined linear congruential generator

Descrierea

float lcg_value ( void )

lcg_value() returns a pseudo random number in the range of (0, 1). The function combines two CGs with periods of 2^31 - 85 and 2^31 - 249. The period of this function is equal to the product of both primes.

Valorile întoarse

A pseudo random float value in the range of (0, 1)

Vedeți de asemenea

  • rand() - Generate a random integer
  • mt_rand() - Generate a better random value

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User Contributed Notes 2 notes

up
5
daniel dot baulig at gmx dot de
4 years ago
Choose your weapon:
<?php
function mt_randf($min, $max)
{
    return
$min + abs($max - $min) * mt_rand(0, mt_getrandmax())/mt_getrandmax();
}
function
lcg_randf($min, $max)
{
    return
$min + lcg_value() * abs($max - $min);
}
function
randf($min, $max)
{
    return
$min + rand(0,getrandmax()) / getrandmax() * abs($max - $min);
}
?>
up
3
rok kralj gmail com
7 years ago
An elegant way to return random float between two numbers:

<?php
function random_float ($min,$max) {
   return (
$min+lcg_value()*(abs($max-$min)));
}
?>
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