在 PHP 中获取随机布尔值真/假
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Get random boolean true/false in PHP
提问by Max Girkens
What would be the most elegant way to get a random boolean true/false in PHP?
在 PHP 中获得随机布尔值真/假的最优雅方法是什么？
I can think of:
我能想到：
$value = (bool)rand(0,1);
But does casting an integer to boolean bring any disadvantages?
但是将整数转换为布尔值会带来任何缺点吗？
Or is this an "official" way to do this?
或者这是一种“官方”的方式来做到这一点？
回答by Ja?ck
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:
如果你不希望有一个布尔类型转换（不是说这有什么问题）你可以很容易地把它变成一个像这样的布尔值：
$value = rand(0,1) == 1;
Basically, if the random value is 1, yield true, otherwise false. Of course, a value of 0or 1already actsas a boolean value; so this:
基本上，如果该随机值是1，产率true，否则false。当然，值0或1已经充当为一个布尔值; 所以这：
if (rand(0, 1)) { ... }
Is a perfectly valid condition and will work as expected.
是一个完全有效的条件，将按预期工作。
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:
或者，您可以mt_rand()用于随机数生成（这是对 的改进rand()）。您甚至可以openssl_random_pseudo_bytes()使用以下代码：
$value = ord(openssl_random_pseudo_bytes(1)) >= 0x80;
Update
更新
In PHP 7.0 you will be able to use random_int(), which generates cryptographically secure pseudo-random integers:
在 PHP 7.0 中，您将能够使用random_int()，它生成加密安全的伪随机整数：
$value = (bool)random_int(0, 1);
回答by Alessandro Battistini
I use a simply
我用一个简单的
rand(0,1) < 0.5
回答by jpenna
Just for completeness, if you want use it in an ifcondition, there is no need to cast, since 0is considered false:
为了完整起见，如果您想在if条件中使用它，则无需强制转换，因为0被认为是false：
if (mt_rand(0,1)) {
// whatever
}
Note: mt_randis 4x faster than rand
注意：mt_rand比速度快 4 倍rand
The
mt_rand()function is a drop-in replacement for the olderrand(). It uses a random number generator with known characteristics using the "Mersenne Twister", which will produce random numbers four times fasterthan what the average libcrand()provides.
该
mt_rand()功能是旧的rand(). 它使用具有已知特性的随机数生成器，使用“Mersenne Twister”，生成随机数的速度是 libcrand()提供的平均速度的四倍。
回答by des1roer
php stan recomended
php stan 推荐
1 === random_int(0, 1)
回答by Cameron Wilby
Technically not as performant as the other answers - but you could also utilize type coercion:
从技术上讲，性能不如其他答案 - 但您也可以利用类型强制：
if(!!rand(0, 1)) {
// random
}
