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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 22 | $previous_status = $post->post_status; |
| 23 | } |
| 24 | |
| 25 | // Get the basics. |
| 26 | $post_content = apply_filters('content_save_pre', $post_content); |
| 27 | $post_content_filtered = apply_filters('content_filtered_save_pre', $post_content_filtered); |
| 28 | $post_excerpt = apply_filters('excerpt_save_pre', $post_excerpt); |
| 29 | $post_title = apply_filters('title_save_pre', $post_title); |
| 30 | $post_category = apply_filters('category_save_pre', $post_category); |
| 31 | $post_status = apply_filters('status_save_pre', $post_status); |
| 32 | $post_name = apply_filters('name_save_pre', $post_name); |
| 33 | $comment_status = apply_filters('comment_status_pre', $comment_status); |
| 34 | $ping_status = apply_filters('ping_status_pre', $ping_status); |
| 35 | |
| 36 | // Make sure we set a valid category |
| 37 | if (0 == count($post_category) || !is_array($post_category)) { |
| 38 | $post_category = array(get_option('default_category')); |
| 39 | } |
| 40 | $post_cat = $post_category[0]; |