Re: variable type - conversion/checking

On 16-3-2013 19:20, Matijn Woudt wrote:

On Sat, Mar 16, 2013 at 6:52 PM, Maciek Sokolewicz < maciek.sokolewicz@gmail.com> wrote:

Hi,

I have tried to find a way to check if a character string is possible to test whether it is convertible to an intger ! any suggestion ? BR georg

All responses in this thread have been very nice; but you could also try a much simpler 2-step check: 1. is_numeric 2. if true > check if there's a decimal character in the string: if(is_numeric($str) && false === strpos('.', $str)) {

    // it's an int for sure

} else {

    // might be a number, but it's definitly not an int

}

Wrong. is_numeric will accept 1e1, which is a float, so you would need to check for e or E too. - Matijn Although in theory I agree, indeed any e* number is treated as a floating point number. However, considering the exponent and the base are forced to be integer numbers (due to exclusion of decimal points), in the real number system, you will *always* end up with a natural number, i.e. integer. Regardless of your input.

So as a result, the input could always be interpreted as an integer, without any precision-loss using the method above. - Tul