为什么这个php数学代码无法正常工作

Question

I am trying to convert this as3 code to php but its not working correctly. I need it like the as3 one generating thanks!

PHP:

print(floor(rand() * 1000) + 3000);

Result:28240000

AS3:

var intCID = Math.floor(Math.random() * 1000) + 3000;
var strSessionId = String(intCID);
trace(strSessionId);

Result:3330

Answer 1

PHP's rand() function gives you a random integer value, not a float (decimal) value. Therefore you get this real big value if you do * 1000

Be sure to check the PHP manual's rand() function. You will see that you can set the min and max value for generated random numbers, like rand(1, 1000)

Hope this help generating your intended values.

Answer 2

You are calling rand() without argument, and according to docs:

if called without the optional min, max arguments rand() returns a pseudo-random integer between 0 and getrandmax()

so you should use this instead :

rand(0,1000)

Answer 3

Description

int rand ( void )

int rand ( int $min , int $max )

If called without the optional min, max arguments rand() returns a pseudo-random integer between 0 and getrandmax(). If you want a random number between 5 and 15 >(inclusive), for example, use rand(5, 15).

Source: http://php.net/manual/en/function.rand.php

Use: rand(0,1) to get the same result

Answer 4

您的AS3代码会生成3000到4000之间的随机数，因此PHP中的等价项为：

$rand = rand(3000, 4000);

Answer 5

In PHP, rand() returns a value from 0 to getRandMax() which is often 32767, and is integer, so the call to PHP rand() should be emulated as this AS3 code:

Math.floor(Math.random()*32768) // returns 0..32767 as integer

The PHP code rand($min,$max) is emulated by the following:

Math.floor(Math.random()*(1+max-min))+min

But, by all means do NOT expect that both PHP and AS3 code will return the exact same value.

Answer 6

您应该使用更好的 （性能明智） mt_rand()

var_dump( mt_rand(3000, 4000) );