The WordPress loop is extremely useful when developing customized WordPress solutions. One bit of code I've had to use often is one that will display a set of code if the page or post is a parent of child of a certain category. This is an easy way to display, output, or show data on all of your WordPress pages that are a parent or child of a specific category.
What the Code Looks Like
If you are familiar with PHP and the WordPress Codex then you'll know that typically you could use conditional tags to detect the page in a conditional statement. This code is separate from the WordPress codex and is just pure server side PHP goodness.
Display Info on Parent and Child Pages
Here's an example of a WordPress Conditional Statement that displays any relevant information if the particular page is named "Foo" and the category is 420.
<?php if(is_page('Foo') || $post->post_parent == '420' ) : ?>
<?php endif; ?>
Used inside the WordPress Loop
<?php if(is_page('Foo') || $post->post_parent == '420' ) : ?>
//here we start the conditional statement
<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
//here we start the wordpress loop
<a href="<?php the_permalink(); ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></a>
//this grabs all post titles and links
<?php endwhile; else: ?>
<?php endif; ?>
//end wordpress loop
<?php else: ?>
//do something else (not necessay but useful)
<?php endif; ?>
//end if
The above example is a bit more complex but makes great use for showing the information you want, where you want on your WordPress site.
Display Info on Parent and Child a WordPress Category
The first examples written above dealt with WordPress pages. Now let's show how do display some data using the WordPress conditional tag in_category()
If Post is in Category
This time around we make use of the in_category() conditional tag. In this example some data will show if the category is Foo.
<?php if(in_category('Foo')): ?>
// my data
<?php endif; ?>
If Post is in Category do WordPress Loop
Here we want to display data through the wordpress loop if in a category
<?php if(in_category('Foo')): ?>
<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>// my data
<?php endwhile; else: ?>
<?php endif; ?>
<?php endif; ?>
Summary
Using the examples above you can create cool customized sidebars and display information across your website in a more dynamic way. Please let me know if you have any problems by using the contact form below!
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