On Saturday, January 15, 2011 07:36:33 am Evil Son wrote:
> On Sat, Jan 15, 2011 at 10:20 AM, David McGlone <david@xxxxxxxxxxxxx> wrote:
> > On Thursday, January 13, 2011 12:45:30 pm Nathan Rixham wrote:
> >> ...
> >> $categorys = array('home', 'services', 'gallery', 'about_us',
> >> 'contact_us', 'testimonials');
> >> foreach($categorys as $category) {
> >> $temp = str_replace("_", " ", $category);
> >> $_GET['page'] != $category && $temp = '<a href="index.php?page='.
> >> $category .'">'.$replace.'</a>';
> >> echo "<li>{$temp}</li>" . PHP_EOL;
> >> }
> >
> > Nathan, thanks for showing me this. I understand the code, except I don't
> > understand how you got by without using a conditional (if/else). If it
> > were me, I would have written it like:
> > ...
>
> The logical operators are lazy i.e. for "&&", if the expression on the
> left is true, then and only then is the right part evaluated. So $temp
> is only modified if
> $_GET['page'] != $category is true.
>
> Either way, you get the same answer, vis a vis if the left is false,
> the "&&" must be false, so no need to evaluate the right side.
>
> This idiom is common in shell scripts and is called among other
> things: "short cut or short circuit evaluation"
Thank you. It's all clear to me now. :-)
>
> > My questions are, is this wrong? is it amaturish?
>
> Not in other languages, I doubt in PHP.
My skills must be improving :-)
--
Blessings
David M.
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