Re: variable type - conversion/checking

On Sat, Mar 16, 2013 at 2:54 AM, Sebastian Krebs <krebs.seb@gmail.com>wrote: > 2013/3/16 Andrew Ballard <aballard@gmail.com> > > > I suppose one could try something like this: > > > > if (is_string($val) && $val === (string)(int)$val) .... > > > > If $val is an integer masquerading as a string, it should be identical to > > the original string when cast back to a string, shouldn't it? (I can't > try > > it right now.) > > > > It is semantically equivalent to > > $val == (int) $val > > and as far as I remember (I didn't read everything completely) this were > mentioned. I didn't read, whether or not, it was accepted as solution ;) > > Sebastian, This is not true. $val === (string)(int)$val will do a string compare, where as $val == (int) $val will do an integer compare, which will convert the left hand to integer too. Your equation will always evaluate as true. Andrews' solution should work too, but it depends on what you accept as integer, in this case you would be able to parse normal numbers, with optionally a sign and extra 0's in front. is_numeric will parse those integers, but also hexadecimal, octal and binary notations, and parses floating point integers. If you don't want the floating points, you could add an extra check that verifies it is not a float. - Matijn