Stuart, Jose - Thanks for your quick response. Are you saying that the
processor echos all the html tags it sees. Is it doing something like this
to the script:
echo <body>
echo <h1>The first twenty Fibonacci numbers:</h1>
echo <ul>
<?php
$first = 0;
$second = 1;
for ($i = 0; $i < 20; $i++) {
?>
echo <li><?php echo $first + $second ?></li>
<?php
$temp = $first + $second;
$first = $second;
$second = $temp;
} ?>
echo </ul>
echo </body>
Or is it just the line in question that is being echoed?
-----------------------------
Nathan Grey
404-337-9005
On Fri, Oct 11, 2013 at 11:06 AM, Stuart Dallas <stuart@xxxxxxxx> wrote:
> On 11 Oct 2013, at 16:01, Nathan Grey <greynng@xxxxxxxxx> wrote:
>
> > Hi - I am new to PHP so this is probably a very rudimentary question. I
> > posed it over at Stack Overflow and got several responses but none of
> them
> > clarified the issue for me.
> >
> >
> http://stackoverflow.com/questions/19309369/trying-to-understand-how-these-php-sections-work-together
> >
> > Here's the code I am trying to understand:
> >
> > <body>
> > <h1>The first twenty Fibonacci numbers:</h1>
> > <ul>
> > <?php
> > $first = 0;
> > $second = 1;
> > for ($i = 0; $i < 20; $i++) {
> > ?>
> > <li><?php echo $first + $second ?></li>
> > <?php
> > $temp = $first + $second;
> > $first = $second;
> > $second = $temp;
> >
> > } ?>
> > </ul></body>
> >
> > This code produces an unordered list of the first 20 Fibonacci numbers. I
> > understand that HTML and PHP can be interspersed. I also understand that
> > the PHP processor will look over the code and pick up the code that is
> > between the opening and closing PHP tags. Here's where I am confused:
> >
> > 1. Can the processor really reassemble a for-loop that is broken into
> > segments by opening and closing tags? It seems like the integrity of the
> > loop would be broken. I would expect that the entire loop would have to
> be
> > contained within a single pair of opening and closing tags for it to
> work.
> >
> > 2. Even if the processor is able to reassemble the loop seamlessly, how
> do
> > the <li> tags get included in the loop since they fall outside of the PHP
> > tags?
>
> Probably the easiest way to understand what's happening is to assume that
> PHP converts anything in the file that's outside PHP tags in to echo
> statements, and then executes the result. This isn't too far from what
> actually happens.
>
> PHP compiles any script in to bytecodes, which it then executes. Anything
> outside PHP tags does, essentially, get passed in to the echo language
> construct.
>
> Does that help at all?
>
> -Stuart
>
> --
> Stuart Dallas
> 3ft9 Ltd
> http://3ft9.com/
>
