lcg_value

(PHP 4, PHP 5)

lcg_value — Combined linear congruential generator

Опис

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.

Значення, що повертаються

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

Прогляньте Також

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

add a note

User Contributed Notes 3 notes

down

rok kralj gmail com ¶

16 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)));
}
?>

down

daniel dot baulig at gmx dot de ¶

14 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);
}?>

down

-23

Linndows ¶

7 years ago


I think best example...
<?php
$x=0;
while($x<=5){
$x++;
echo lcg_value()+$x."\n";   }
     echo lcg_value()+$x-(2*lcg_value()); echo "\n";
?>

add a note