php 检查整数或浮点值
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check for integer or float values
提问by Asim Zaidi
I have this
我有这个
$number = 0.5
if (is_float($number))
{
echo 'float';
}
else
{
echo 'not float';
}
and it echos not float. what could be the reason thanks
它回声不浮动。可能是什么原因谢谢
回答by Artefacto
Probably $numberis actually a string: "0.5".
可能$number实际上是一个字符串："0.5".
See is_numericinstead. The is_*family checks against the actual type of the variable. If you only what to know if the variable is a number, regardless of whether it's actually an int, a floator a string, use is_numeric.
见is_numeric来代替。该is_*系列检查变量的实际类型。如果您只知道变量是否为数字，而不管它实际上是 an int、afloat还是 a string，请使用is_numeric.
If you need it to have a non-zero decimal part, you can do:
如果你需要它有一个非零的小数部分，你可以这样做：
//if we already know $number is numeric...
if ((int) $number == $number) {
//is an integer
}
回答by Noor
If you are checking just for the .(dot)then you do not need to typecastbut manipulate it as a string with [strpos][1]().
如果您只是检查 ，.(dot)那么您不需要typecast而是将其作为字符串进行操作[strpos][1]()。
if (strpos($number,'.') !== false) {
echo 'true';
}else {
echo 'false';
}
回答by dale3h
If I understand correctly, using the typecast will allow you to check int and float properly regardless of the machine's locale. However, I could be very wrong...I am not sure if PHP supports decimal locales, such as the comma (,) for certain countries.
如果我理解正确，无论机器的语言环境如何，使用类型转换都可以让您正确检查 int 和 float。但是，我可能是非常错误的...我不确定 PHP 是否支持十进制语言环境，例如某些国家/地区的逗号 (,)。
