An elegant way to return random float between two numbers:
<?php
function random_float ($min,$max) {
return ($min+lcg_value()*(abs($max-$min)));
}
?>
(PHP 4, PHP 5, PHP 7, PHP 8)
lcg_value — Combined linear congruential generator
lcg_value() returns a pseudo random number in the range of (0, 1). The function combines two CGs with periods of 2^31 - 85 and 2^31 - 249. The period of this function is equal to the product of both primes.
Esta função não gera valores criptograficamente seguros e não deve ser usada para propósitos criptográficos ou fins que exijam que os valores retornados sejam impossíveis de adivinhar.
Se aleatoriedade criptograficamente segura for necessária, a classe Random\Randomizer pode ser usada com o mecanismo Random\Engine\Secure. Para casos de uso simples, as funções random_int() e random_bytes() fornecem uma API conveniente e segura que é garantida pelo CSPRNG do sistema operacional.
Scaling the return value to a different interval using multiplication or addition (a so-called affine transformation) might result in a bias in the resulting value as floats are not equally dense across the number line. As not all values can be exactly represented by a float, the result of the affine transformation might also result in values outside of the requested interval.
Use Random\Randomizer::getFloat() to generate a random float within an arbitrary interval. Use Random\Randomizer::getInt() to generate a random integer within an arbitrary interval.
Esta função não possui parâmetros.
A pseudo random float value between 0.0 and 1.0, inclusive.
An elegant way to return random float between two numbers:
<?php
function random_float ($min,$max) {
return ($min+lcg_value()*(abs($max-$min)));
}
?>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);
}?>