函数来检查值是int还是float而不是PHP中的字符串

问题描述：

Is there any build-in function to check the value is number, in any integral type, like int, float but not string. is_numeric return true for "2". should I check it by both is_int and is_float?

The function that I want should return "invalid value" when $a and $b are not number:

function myFunction($a, $b, $sign){}

是否有任何内置函数来检查值是否为数字，在任何整数类型中，如int，float但是 not string。 is_numeric为“2”返回true。我应该通过is_int和is_float检查它吗？ p>

当$ a和$ b不是数字时，我想要的函数应返回“无效值”： p>

  function myFunction（$ a，$ b，$ sign）{} 
  code>  pre> 
  div>

答

is_numeric($value) && !is_string($value)

this is what I was looking for

答

This isn't an answer per se, but this is too much to put in a comment:

function isFloatOrInt($var)
{
    $type = gettype($var);

    switch ($type) {
        case 'integer':
        case 'double':
            return true;
        case 'string':
            //check for number embedded in strings "1" "0.12"
            return preg_match('/^[0-9]+(?:\.[0-9]+)?$/', $var);
        default:
            return false;
}

Preg match can be useful here if you consider the string version of a number to still be a number.

You say

But not string

But does that mean this 'string' or this '10' instead of 10 for example, ie. a string that is also a number?

There is probably many ways to do this, but there are some edge cases so it's largely depends on your needs. For example is an octet a number to you 0777 or and exponent 12e4 or even Hexadecimal 0xf4c3b00c?

函数来检查值是int还是float而不是PHP中的字符串

相关推荐