If anyone read this post, you probably already forgot about it, but I
just wanted to clarify that I found the source of the problem and it was
a coding mistake on my part, not a problem with PHP's array
implementation.
Erik
On Thursday, June 6, 2002, at 03:11 PM, Erik Price wrote:
> Hi all,
>
> a quick question about using PHP's objects, specifically in terms of
> the scope of class attributes:
>
> Normally, in PHP, a variable in a function is local to that function
> and is NOT a reference to a similarly-named variable outside the
> function, right? To the best of my knowledge, there are several ways
> to allow access to an outside variable from within a function:
>
> 1) Declare the variable as global with the "global" keyword
> 2) Access it from the $GLOBALS array
> 3) Pass the variable to the function as a parameter
>
> and probably others, but it's really beside the point because I don't
> have a question about normal functions. What I am really wondering is
> if there is any formal "rules" about the scope of Class Attributes in
> Class definitions and in methods -- they do not behave identical to
> PHP's functions. For instance, I can access a class attribute from
> within a method of that class without explicitly declaring that
> attribute global inside the method, or without explicitly passing that
> attribute as a parameter to the method. So they seem to behave as if
> they are always global.
>
> But if I want to make a change to that class attribute from within a
> method, am I affecting a copy of the class attribute, or the class
> attribute itself? The reason I ask is because I have a Class that is
> behaving oddly. Here is the relevant part of the code:
>
> Class Folder
> {
> // declare class attributes
> var $contents = array();
>
> // a method to add to $contents
> function add_to_contents($item)
> {
> $this->contents[] = $item;
> }
>
> // a method to remove from $contents
> function rm_item($index)
> {
> unset($this->contents[$index]);
> }
> }
>
>
> The crux of my question is, does this have the effect that it appears
> to have? I am hoping someone with thorough understanding of the
> internals of PHP can give me a definitive answer. My tests are coming
> up with strange results, so I haven't figured it out on my own yet.
>
> Thanks in advance,
>
>
> Erik
>
> PS: FYI, if you unset an array element, there is still an index for
> that element -- the array does not reindex itself. A good solution to
> this, that a fellow lister named Nathan gave me, is to array_push() a
> dummy var onto the end of the array and then array_pop() it back off --
> this reindexes the array. But I am finding that somehow my arrays are
> "remembering" old elements that I could have sworn I unset, so I am
> asking the above question about the scope of class attributes in
> methods.
>
>
>
----
Erik Price
Web Developer Temp
Media Lab, H.H. Brown
[EMAIL PROTECTED]
>
>
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