Kodrik, you are picking the wrong person to argue with. ;)
> > > 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.
Completely incorrect.
> 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");
if() doesn't check for null, it checks for a boolean false condition.
Does 0 evaluate to false? Sure it does. So does "" and "0". That
doesn't mean they are null.
> $value="0"
> if($value) printf("$value does have a value if I put "0" instead of 0<br>\n");
That is completely wrong as well. You obviously didn't try your own
example. The following all evaluate to false:
if(0)
if(false)
if(null)
if("0")
if("")
But the fact that they all evaluate to false says nothing about whether
they are values or not. Just like all of these all evaluate to true:
if(1)
if(true)
if("abc")
if(-1)
That doesn't mean that 0 == null anymore than it means that 1 == -1. Just
because two values both evaluate to the same boolean state does not mean
they are one and the same.
-Rasmus
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