php 使用PHP生成两个小数之间的随机小数
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Use PHP To Generate Random Decimal Beteween Two Decimals
提问by Nick Roskam
I need to generate a random number, to the 10th spot between 2 decimals in PHP.
我需要生成一个随机数,到 PHP 中两位小数之间的第 10 位。
Ex. A rand number between 1.2 and 5.7. It would return 3.4
前任。一个介于 1.2 和 5.7 之间的兰特数。它会返回 3.4
How can I do this?
我怎样才能做到这一点?
回答by codaddict
You can use:
您可以使用:
rand ($min*10, $max*10) / 10
or even better:
甚至更好:
mt_rand ($min*10, $max*10) / 10
回答by Deleteman
You could do something like:
你可以这样做:
rand(12, 57) / 10
PHP's random function allows you to only use integer limits, but you can then divide the resulting random number by 10.
PHP 的 random 函数允许您只使用整数限制,但您可以将结果随机数除以 10。
回答by driangle
A more general solution would be:
更通用的解决方案是:
function count_decimals($x){
return strlen(substr(strrchr($x+"", "."), 1));
}
public function random($min, $max){
$decimals = max(count_decimals($min), count_decimals($max));
$factor = pow(10, $decimals);
return rand($min*$factor, $max*$factor) / $factor;
}
$answer = random(1.2, 5.7);

