Hello Jaap,
Friday, June 10, 2005, 10:01:10 AM, you wrote:
> NULL comes from C I think and stands for an uninitialized
> pointer. There is no other way to empty a pointer except
> by using 'pointer=(*char)0;', using NULL is more clear.
you shall never cast 0 to anything since 0 matches any pointer.
Casting it would result in a typecast error or an unneccessary
casting. Thus #define NULL 0 is the only way. But that apart :-)
> Instead of filling a variable with a null pointer one
> can unset() a variable in PHP.
> I have no problems with integers and strings being
> promoted to booleans, except for example that an
> empty string is considered to be false and even
> (in some versions?) a string containing '0' or even
> 'false' or even 'NULL'?
> I like to write:
> while (fgets($hf)) {
> }
> But this fails when an empty string is considered to be
> false. BTW. the behaviour also depends on the fact if
> "\r\n" is considered to be empty or not.
Yes you definitively come from C.
(...)
> BTW. Wouldn't it be a good idea to split this
> mailing list in a list about the definition
> of the PHP language and the implementation and
> versions etc.?
We had that before and theoretically there are more lists which nobody
uses anymore. And then i think it is a very good idea that the developers
get feedback. There is a lot of noise but still a fair amount of really
good mails here that help direct the way PHP evolves.
>>Not promoting types would mean adding false++, and true-- doesn't it?
> false is a constant and can't be increment.
It was a shortcut for $a=false; $a++; $b=true; $b--; of course. However
the shortcut is much easier to get.
> When you are in favor of incrementing booleans
> you should also be able to increment a veriable
> with the value true, but should it become false,
> 0 or 2 or stay the same?
Since PHP conversion magic: true+1 => 2; false+1 => 1; 1+1 = >2
(...)
BTW, Nice commenting on the: ($p=strpos())++
Best regards,
Marcus mailto:[EMAIL PROTECTED]
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