A Few Words about WP_Query in Java

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A Few Words about WP_Query
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WP_Query is the heart of the loop, even though you don t see it spelled out in the most basic code. It is really a class that handles all the loop magic, and you ll find it in wp-includes/query.php if you want to dig deep within the WordPress core files. Most of you will be happy with the Codex page (codex.wordpress.org/Function_Reference/WP_Query) explaining all the properties and methods that go with WP_Query. The basic loop uses WP_Query, or rather it uses the default $wp_query object. This means that when you use necessities such as have_posts() and the_post() you ll in fact use $wp_query->have_posts() and $wp_query->the_post(). In other words, have_posts() and its friends take it for granted that you want to be using $wp_query. Whenever you go outside $wp_query by creating your own queries, as we ll do in the multiple loops section as well as in examples and adaptations further into the book, you ll have to create an object for it. Like this:
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< php $brand_new_query = new WP_Query(); >
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Here, you re loading everything into $brand_new_query instead of the default $wp_query, and that means that you can do stuff outside of the main loop. Most things will connect to the WP_Query class, including templates and conditional tags. These should always be used if possible. You can tap into and alter things within the WP_Query class, but you should refrain from it if there is an available solution already. That s just common sense. Naturally, there may come a time when you want to do things that are truly out of the box, but that s a whole other matter.
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Now that you ve established where you need the loop (in post listings, no matter if it is one or several), and that you can run several of them at once, the question becomes how to use it well rather than just use it. For one thing, maybe you don t want to display the full post in your category listings maybe you just want an excerpt This brings you back to the template tags, and the ones that control the output of the loop. This section takes a quick look at the most frequently used tags. Chances are, you ll want to display and link the title of the various posts. This little code snippet is present in just about every theme s template files that list several posts, and sometimes in the ones that just display the one as well:
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<h2><a href="< php the_permalink(); >" title="< php the_title(); >">< php the_title(); ></a></h2>
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It s really simple: using the tags for outputting the post title, you display just that (and also use it for the title attribute in the link). Around the title is a traditional hyperlink, getting its href value from < php the_permalink(); >, which of course is the permalink to the post in question. Nothing weird or anything there, so let s output some content. Here you have two options, using either one of these two template tags: 34
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< php the_content() ; > < php the_excerpt() ; >
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The first one outputs the full post content, unless you re on a page listing several blog posts. In that case, it outputs the content until the point where the <! more > tag is inserted, which may not be used and then the full post is displayed. If you re a WordPress user you know all about that one; it is the More button in the HTML editor, inserting a Read More link. Incidentally, you can make that appear in any way you like. For example:
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< php the_content('Read more here, mate!') ; >
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This would change the default read more link text to Read more here, mate! instead. There are more options for this, and you can even put HTML code in it (or perhaps a graphic instead of text), but that s a discussion for another time. The important thing is that the template tag the_content() outputs the post content, and if it is a blog, listing it breaks it with a read more link if the <! more > tag is inserted. Naturally, when you re on a single-post page, and the_content() is used (whether a custom read more text is defined or not), it won t output a read more link. You ll see the full post. The second content template tag available is the_excerpt(). As the name implies, it only outputs an excerpt of the actual content, by default the first 55 words. All HTML, whether it
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