PHP "if" statement to include content based on ID [Archive]

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luispunchy

October 8th, 2007, 03:25

Hi... I need help calling in a PHP include file based on an ID placed on the 'body' element, but can't figure out the proper "if" statement to do that. I know just enough PHP to be dangerous ;) so if there is a simple and easyily explained solution, I'd very much appreciate your help.

details:

I have a standard sidebar of modules, which is being included in all pages via a simple 'php include ()' statement:

<?php // INCLUDE SIDEBAR.PHP ?>
<?php include('includes/sidebar.php'); ?>
<?php // END SIDEBAR.PHP ?>

This gets included on *all* pages.

Then I have a few unique pages - one is 'articles.php' - which require that same sidebar to be included, but with one additional module appended - which is itself a PHP include file called 'unique-module.php'.

This extra module is *only* to be included in the sidebar on these few unique pages. Additionally, this extra module needs to be placed in the middle of the overall sidebar.php file, so I can't just call it in as a separate include in the base pages. (if that makes sense).

I also can't use a simple CSS solution to hide it or show it (i.e., with 'display' definitions based on whether particular selector combinations are present on the calling page) because that will still leave the unique content showing when styles are turned off.

I need a truly dynamic control here, and I think a php "if" statement will do the trick, I just can't figure it out on my own.

I am thinking I can do this using the unique page ID attributes I've put on each pages' 'body' tag. For example, for the unique "articles.php" page, the 'body' tag has an ID:

<body id="articles">

So I am guessing I should be able to use a php "if" / include statement in the actual 'sidebar.php' include file itself that basically says "if body ID = 'articles', then include 'unique-module.php'. This way, when the 'sidebar.php' include file gets called by the base page, it can be passed that ID and be instructed to include its interior 'unique-module.php' include file.

In layman's terms, that's the goal. Make sense? I'm sure it's easy enough, but I haven't found it yet.

Thanks for any help!

inimino

October 8th, 2007, 03:41

Hi... I need help calling in a PHP include file based on an ID placed on the 'body' element, but can't figure out the proper "if" statement to do that.

Well, you can't do that. :)

So I am guessing I should be able to use a php "if" / include statement in the actual 'sidebar.php' include file itself that basically says "if body ID = 'articles', then include 'unique-module.php'.

The goal of PHP (and indeed any HTTP server) is to push the bits out to the client as soon as possible. Since the PHP is generating your HTML output (not the other way around) it's assumed that you already know what your HTML contains. In other words, PHP doesn't parse the HTML on the server, and there's no appropriate way for your PHP to query attributes on the HTML in which that PHP is embedded.

Instead, you could "step up" to the level of PHP, and set a variable there on each appropriate page.

//in the containing page...
$include_sidebar_extras = true;
...
include('sidebar.php');

//in sidebar.php...
if($include_sidebar_extras) {
...
}

luispunchy

October 8th, 2007, 04:46

Steppin' up! ;) I do understand all that, I guess I just didn't explain myself well enough. Your example is pretty much exactly what I was thinking of, I just don't know the syntax for writing it :)

I tried and I get an error message:

Parse error: parse error, unexpected '}'

I think maybe I'm using incorrect syntax - here's what I have inside my sidebar.php:

<?php
if ( $include_sidebar_extras ) {
include("sidebar-extra.php")
}
?>

can you tell me, is a semicolon needed to close an include function that is contained within that if statement?

inimino

October 8th, 2007, 05:35

The semicolon is required, that's why there's a parse error.

Servetech

October 8th, 2007, 11:03

One of the best ways to learn is trial and error, so the speediest option there (in my opinion) would of just to tried throwing a semicolon onto the end of the include statement (to find that the error dissapears!) :)

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