String to int/float

Question

I have a number that comes as a string from an input. It could be "450.021" or "30". I need to determine whether it is int or a float number. How do I do that?

I tried with intval but apparently floating numbers are floored and in my case it is not going to help me.

http://php.net/manual/en/function.is-float.php read this php manual — Bilal Ahmed, Sep 25 '17 at 13:16
Have you tried searching the string for a `.`? http://php.net/manual/en/function.strpos.php — Prav, Sep 25 '17 at 13:16
@PraveenM No but I need to also allow it to be a string in case it is a text. — blako, Sep 25 '17 at 13:19
You can try regex to determine if the string has numbers and if there's a `.` between numbers. http://php.net/manual/en/function.preg-match.php . https://regexr.com/ — Prav, Sep 25 '17 at 13:23

huehnerhose · Answer 1 · 2017-09-25T13:28:58.567

Very naiv approach

    foreach(["342.23", "30"] as $a) {
        if( (float)(int)$a === (float)$a ) {
            echo "int";
        } else {
            echo "float";
        }
    }

But this won't catch cases where you parse "340.0".

Edit: Digging a bit more:

    foreach(["342.23", "30"] as $a) {
        $is_float = filter_var($a, FILTER_VALIDATE_FLOAT);
        $is_int = filter_var($a, FILTER_VALIDATE_INT);

        if( $is_float && $is_int ) {
            echo $a . " is Int";
        } else if( $is_float && !$is_int ) {
            echo $a . " is Float";
        }

    }

String to int/float

1 Answers1