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You'll want to hook into the_content to add a message. Something like this: <?php add_filter('the_content', 'wpse51338_filter_content'); /* * Filter the content to add a message before and after it …

http://codex.wordpress.org/Function_Reference/has_term So... <?php if ( has_term('products', 'your_custom_taxonomy', $post ) ) { get_template_part('products'); } elseif ( has_term( 'downloads …

Caution: very mac/linux/unix centric thoughts ahead. Includes a lot of command line fu. Put All the Code Under Version Control I like git. Mark Jaquith has some good suggestions on keeping an enti …

This should be doable. First step would be pointing each domain to the same document root/install of WordPress. Next up, use WP_HOME and WP_SITEURL in wp-config.php that change based on $_SERVER['HT …

What you want is a rewrite endpoint. You're already familiar with these. WordPress' urls that end with feed are simple a rewrite endpoint, and you can add your own! add_rewrite_endpoint takes two a …

I would go with option 4: A simple SQL statement (UPDATE {$wpdb->posts} SET post_type = 'testimonial' WHERE post_type = 'post' AND post_status = 'publish' or something like that) to move the current …

This tutorial on adding custom meta boxes is also really good: http://webdesignfan.com/custom-write-panels-in-wordpress/ It's all very flexible; you should be able to reuse the code you create.

The first thing to remember about the post editing screen is that everything (except for the post title, editors, permalink, etc.) is a meta box. Since you can easily add and remove meta boxes, there …

I almost always define my own constants for things involving URLs (pattern 3). The reasons: Enqueueing does not account for child theme files. Using get_style_sheet_directory_uri will obviously …

As long as... You use $wpdb->prefix (or $wpdb->base_prefix) to prefix the table Your table name is someplace public, and easily available for other plugins, themes and end users to use and extend …

I would not recommend that. Much easier to use a clearfix hack to force clearing and just add that style to your widget. Clearfix hacks are transparent: it doesn't matter if they happen on all element …

You can hook into wp_insert_post_data and change things. <?php add_filter('wp_insert_post_data', 'wpse67262_change_title'); function wpse67262_change_title($data) { $data['post_title'] = 'This wi …

The biggest thing is the wp-config.php contains some sensitive information: your database username/password, etc. So the idea: move it outside the document root, and you don't have to worry about any …

If each plugin/theme functions on its own, then you should probably drop the the library in every theme/plugin. Then just check to see if it a class or function from the third-party library exists be …

Basically the img_caption_shortcode filter allows you to completely replace the default image caption. If you want to do that, you'll need to ask WP to pass all the argument of the filter to your cal …