is_numeric还是数字preg_match？-is_numericoranumericpreg_match?

Here is what is_numeric() considers to be a numeric string:

以下是is_numeric()认为是一个数字字符串:

Numeric strings consist of optional sign, any number of digits, optional decimal part and optional exponential part. Thus +0123.45e6 is a valid numeric value. Hexadecimal notation (0xFF) is allowed too but only without sign, decimal and exponential part.

数字字符串由可选符号,任意数量的数字,可选的小数部分和可选的指数部分组成。因此+ 0123.45e6是有效的数值。也允许使用十六进制表示法(0xFF),但只能使用符号,十进制和指数部分。

If you only want to check if a string consists of decimal digits 0-9, you could use ctype_digit().

如果您只想检查字符串是否包含十进制数字0-9,则可以使用ctype_digit()。

One can also check using ctype_digit() to check if its a true number.

还可以使用ctype_digit()检查它是否为真数。

Regex would obviously be your better option, however it does come with an overhead. So it really depends on your situation and what you want to do.

正则表达式显然是你更好的选择,但它确实带来了开销。所以这真的取决于你的情况和你想做的事情。

Is it for validating user input? Then the overhead of using a regexp or asserting it doesn't contain an "x" and is_numeric() wouldn't be too much overhead.

是用于验证用户输入吗?然后使用正则表达式或断言它的开销不包含“x”和is_numeric()不会有太多的开销。

If you just want to check that something is an integer, try this:

如果您只想检查某事是否为整数,请尝试以下方法:

function isInteger($value){
    return (is_numeric($value) ? intval($value) == $value : false);
}

If you want to check for floats too then this won't work obviously :)

如果你想检查花车那么这显然不会起作用:)