Re: The Context of 0

On Tue, 2007-10-02 at 12:14 -0500, Jay Blanchard wrote: > [small rant] > This morning's thread on strpos() brings up an interesting point, zero > has a context. > > In certain cases 0 is the equivalent of FALSE and in other cases a 0 is > just a 0. In the context of strpos() 0 indicates that the needle is in > the first position of the haystack. If the needle is not found in the > haystack a Boolean FALSE is returned. In this case 0 is not the > equivalent of FALSE. > > There are other cases, most of them specific to strings, in which 0 is > not the equivalent of FALSE. Newbies to PHP or certain functions will no > doubt encounter these cases at some point. > > Exercise care when using 0 to determine if something is FALSE and > understand that 0 has context. > [/small rant] I don't know why this is a rant. In most languages 0 is equivalent to false. Even in C when you: #define FALSE 0 If you want to match false exactly then use the tools provided. Namely the equality operator === and not the equivalence operator ==. Cheers, Rob. -- ........................................................... SwarmBuy.com - http://www.swarmbuy.com Leveraging the buying power of the masses! ...........................................................