一些随机的布尔值true / PHP中假 [英] Get random boolean true/false in PHP
问题描述
什么是最优雅的方式来获得一个随机的布尔真/假的PHP?
What would be the most elegant way to get a random boolean true/false in PHP?
我能想到的:
$value = (bool)rand(0,1);
但是否投了整数布尔带来什么缺点?
But does casting an integer to boolean bring any disadvantages?
或者这是一个官方的方式做到这一点?
Or is this an "official" way to do this?
推荐答案
如果你不希望有一个布尔投(不是说有什么不对的),你可以很容易地使这样一个布尔值:
If you don't wish to have a boolean cast (not that there's anything wrong with that) you can easily make it a boolean like this:
$value = rand(0,1) == 1;
基本上,如果随机值 1
,收益率真正
,否则假
。当然,值 0
或 1
已的作用的为一个布尔值;所以这个:
Basically, if the random value is 1
, yield true
, otherwise false
. Of course, a value of 0
or 1
already acts as a boolean value; so this:
if (rand(0, 1)) { ... }
是一个完全有效的条件,并会正常工作。
Is a perfectly valid condition and will work as expected.
另外,你可以使用 mt_rand()
随机数生成(它结束了的改善兰特()
)。你甚至可以去尽可能 openssl_random_pseudo_bytes()
这个code:
Alternatively, you can use mt_rand()
for the random number generation (it's an improvement over rand()
). You could even go as far as openssl_random_pseudo_bytes()
with this code:
$value = ord(openssl_random_pseudo_bytes(1)) >= 0x80;
更新
在PHP 7.0,你将能够使用 random_int()
,该生成加密安全伪随机整数:
Update
In PHP 7.0 you will be able to use random_int()
, which generates cryptographically secure pseudo-random integers:
$value = (bool)random_int(0, 1);
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