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As you ll probably have gathered, cat_ID=130 tells you that the ID is 130. Remember, category IDs (or any IDs really) don t relate to the each other in any other way than that they are all numerical values. Posts, categories, tags, and everything else are mixed, so you can have one category with ID 3 and the next may have ID 749. Back to the example: we don t want to display posts from the asides category, which has the ID 130. The query_posts() page in the Codex (codex.wordpress.org/Template_Tags/ query_posts) says that you can use a number of ways to pass category information to query_ posts(), but in this case, use the cat parameter, which takes IDs:
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< php query_posts('cat=-130'); >
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This, in front of the loop as stated previously, will exclude posts belonging to the category with the ID 130. Notice the minus sign in front of the ID: you really need that. If you forget about it, you would get the exact opposite result, which would be to show only posts from the category with
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ID 130. There are a lot of times when a minus sign in front of an ID number will mean that you exclude that particular ID, so that s useful to know. Next, display posts tagged with blue, green, or yellow. It is easy enough; just apply this before the loop:
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< php query_posts('tag=blue+green+yellow'); >
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Here, you obviously use that particular tag parameter. There s a bunch of those as well, just as with categories. Other things you can do with query_posts() are fetch posts from a specific author, do time-based queries, and order whatever data you choose any way you like. You can even grab the custom fields data and do things with that, which means that posts suddenly can get even more parameters to be sorted with. You ll do a lot of these things later on when you re building cool WordPress-powered sites. One snag you may run into when doing things with query_posts() is the number of posts being returned. This is still controlled by the main WordPress settings related to how many blog posts to display per page in fact. Luckily, you can control that as well. Say you want your front page to display just five posts, but all other listings should display 10. You can tackle this problem in two ways. You can either create a home.php template, and do the query_post() magic there, or use a conditional tag for your index.php template. Start with the home.php variant since it is the cleanest and easiest one. Using query_posts() and the posts_per_page parameter, you can control these things: 43
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< php query_posts('posts_per_page=5'); >
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By placing that before the loop on your home.php template, you ll display five posts per page. Simple, huh Now, put those conditional tags to use and add this functionality to the index.php page instead, because you really don t need a separate home.php for this. All you need to do is use the conditional tag is_home() in an if clause to check if you re on the home page. If not, nothing will happen, but if you are, the query_posts() statement will go through. By adding this before the loop in index.php you achieve the same thing as you did with the home.php template:
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< php if (is_home()) { query_posts('posts_per_page=5'); } >
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Now, since you can limit the number of posts, naturally you can remove the limit as well. Just set the posts_per_page parameter to -1 and you ll show all posts that fit the loop criteria. Beware of putting that on a blog with thousands of posts, since if you do that on the front page it will show all your posts, and that s not a fun SQL query to pass to the database at all. That being said, why not show all posts written by the author with the name TDH, published in 2009
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