> The integer 0 is equal to False, but not Null.
Not quite true. 0 evaluates to false. They are not equal. Try this:
if(0==false) echo "1";
if(0===false) echo "2";
You will find that this only prints "1". 0 and false are distinct and
separate values. This is something that confuses a lot of people,
especially in conjunction with something like the strpos() function which
will return 0 when it matches something at position 0 in the string, but
it returns false when there is no match. A lot of people will mistakenly
do:
if(strpos("abcdef","abc")) { ... }
and then be confused that the condition appeared not to be met. What they
actually should have done was:
if(strpos("abcdef","abc")!==false) { ... }
So be careful and try to think of 0 and false as distinct and separate
entities and you will avoid coding mistakes like this.
-Rasmus
> > Robin
>
> Kodrik wrote:
> >
> > > > If you set $qty=0; then $qty has no value.
> > >
> > > Of course it has a value.
> >
> > No it doesn't have a value.
> > PHP interprets 0 as null.
> >
> > A very easy way for you to check:
> >
> > $value=0;
> >
> > if(!$value) printf("$value doesn't have a value (it didn't even print
> > 0)<br>\n");
> >
> > $value="0"
> > if($value) printf("$value does have a value if I put "0" instead of 0<br>\n");
> >
> > --
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>
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