> If I put 0 filter_var() will return false.

Actually it returns the integer 0, not the boolean FALSE. Here's an
illustration of the difference:


The integer value 0 can masquerade as "false" in an if() statement, of
course, as Ash pointed out above.

> If I put 0342352 filter_var() will also return false.

How is 0342352 being assigned to the variable that you're filtering?
If PHP thinks it's a string, then the filter will fail. If PHP thinks
it's a number, it seems to convert it internally to the number 115946,
before you get to the filter.  Not sure what's going on there. At any
rate it will then pass FILTER_VALIDATE_INT, but the value's not going
to be what you expect. You can see it happening here:



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