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Posted by Vince Morgan on 04/10/07 00:16
"Shooter" <SDshooter@hotmail.com> wrote in message
news:46196360$0$5759$4c368faf@roadrunner.com...
> I'm having trouble setting up a while loop, and I think I'm creating
> overlapping brackets. I'm trying to set up a script to check for up to 3
> images to display on a profile page, then put a notice at the bottom. My
> initial efforts either get a blank page or the notice appearing a few
> hundred times. Below is my original (working) script to display a single
> image. After that is my attempts at adding a while loop. Is there a better
> way of doing this??
> Trying to add a loop:
>
> //start imagename function
> //begin new code
> $imagenum=1;
> while ($imagenum<4) {
> //end new code
> $imagename = "$lastname$firstname$imagenum";
> $imagename = str_replace(" ", "","$imagename");
> //end imagename function
> //$filename = '../images/$imagename.jpg';
> $image_info =
> @getimagesize("http://www.mydomain.org/images/$imagename.jpg");
> $type=$image_info[2];
> if ($type == 0) {
> // file_exists(realpath($filename)); {
> print " ";
> } else {
> print "<IMG SRC=\"../images/$imagename.jpg\"><BR>";
> $imagenum = $imagenum++;
> } // end while loop
> print "<FONT color=\"#000000\" face=\"Arial, Helvetica, sans-serif\"
> size=\"1\">
> © $firstname $lastname. All Rights Reserved.</FONT>";
> }
>
Sorry to highjack the OP.
I find the above very curious personaly.
I could be wrong, but I thought "++" had a higher precedence than "=", in
fact I'm very sure it does.
However, having said that, "$imagenum++" is a post-increment, which would
suggest that although the "++" operator has higher precedence the
incrementation should occure after the assignment.
Although I have never used a construct such as $val = $val++, I would have
thought that after the assignment, the next operation would have been the
increment. If that were actualy true then I would expect the value to have
incremented by one before the next loop iteration regardless.
A test shows it doesn't, so I'm wrong.
Trying to actualy work out what is going on in the expression in question
makes my brain hurt. It seems that the increment is being discarded
altogether.
Is this actualy an example of undefined behaviour?
Vince Morgan
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