问题描述
我想在网站上建立一个出价系统.这意味着用户可以发布其出价(自然数).我想确保用户不要尝试发布字符,十进制数字等.我不想使用is_numeric函数,因为允许使用十六进制表示法.我当时想为此使用preg_match.但是在php.net中,有关此功能的文档很少,我也不知道如何使用preg_match.
I want to make a bid system on a website. That means users can post their bid (natural number). I want to make sure users don't try to post characters, decimal numbers, etc.I don't want to use is_numeric function because hexadecimal notation is allowed.I was thinking to use preg_match for this. But in php.net the documentation for this function is little and I have no idea how to use preg_match.
那么我应该如何检查变量是否为带有preg_match的自然数?
So how should I check if a variable is a natural number with preg_match?
推荐答案
如果您不需要小数点: ctype_digit
或filter_var($var, FILTER_VALIDATE_INT)
.
如果您这样做: filter_var($var, FILTER_VALIDATE_FLOAT)
.
If you don't require decimal points: ctype_digit
or filter_var($var, FILTER_VALIDATE_INT)
.
If you do: filter_var($var, FILTER_VALIDATE_FLOAT)
.
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