[SR-Users] how can string "0" be equal to int 0?

[Andrei Pelinescu-Onciul]

On Oct 15, 2010 at 13:44, Juha Heinanen <jh at tutpro.com> wrote:
> Andrei Pelinescu-Onciul writes:
> 
> > Because "==" works only with arguments of the same type, 0 it's
> > autoconverted to "0". The alternative would be to log an error.
> 
> andrei,
> 
> please log an error, because it is hard to remember this uncommon
> comparison rule and seeing an error message would reveal the problem
> fast.
> 
> > Here are the rules for ==:
> > /* if left is string, eval left & right as string and  use string diff.
> >  * if left is int eval as int using int diff
> >  * if left is undef, look at right and convert to right type
> >  */
> 
> getting back to the example code, how can i check if value of a var
> is int 0?  is there an is_int function?

No, there is no is_int function, but you could use a hack:

if (($v == 0) && ($v + 0 == (str)0))

will be true only if $v is int and == 0 ($v == 0 makes sure that
$v!="").

Andrei