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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 18 | $update = false; |
| 19 | if ( !empty($ID) ) { |
| 20 | $update = true; |
| 21 | $post = & get_post($ID); |
| 22 | $previous_status = $post->post_status; |
| 23 | } |
| 24 | |
| 25 | // Get the basics. |
| 26 | $post_content = apply_filters('content_save_pre', $post_content); |
| 27 | $post_excerpt = apply_filters('excerpt_save_pre', $post_excerpt); |
| 28 | $post_title = apply_filters('title_save_pre', $post_title); |
| 29 | $post_category = apply_filters('category_save_pre', $post_category); |
| 30 | $post_status = apply_filters('status_save_pre', $post_status); |
| 31 | $post_name = apply_filters('name_save_pre', $post_name); |
| 32 | $comment_status = apply_filters('comment_status_pre', $comment_status); |
| 33 | $ping_status = apply_filters('ping_status_pre', $ping_status); |
| 34 | |
| 35 | // Make sure we set a valid category |
| 36 | if (0 == count($post_category) || !is_array($post_category)) { |
| Line | Code |
| 214 | |
| 215 | if ( is_object($object) ) |
| 216 | $object = get_object_vars($object); |
| 217 | |
| 218 | // Export array as variables |
| 219 | extract($object); |
| 220 | |
| 221 | // Get the basics. |
| 222 | $post_content = apply_filters('content_save_pre', $post_content); |
| 223 | $post_excerpt = apply_filters('excerpt_save_pre', $post_excerpt); |
| 224 | $post_title = apply_filters('title_save_pre', $post_title); |
| 225 | $post_category = apply_filters('category_save_pre', $post_category); |
| 226 | $post_name = apply_filters('name_save_pre', $post_name); |
| 227 | $comment_status = apply_filters('comment_status_pre', $comment_status); |
| 228 | $ping_status = apply_filters('ping_status_pre', $ping_status); |
| 229 | $post_mime_type = apply_filters('post_mime_type_pre', $post_mime_type); |
| 230 | |
| 231 | // Make sure we set a valid category |
| 232 | if (0 == count($post_category) || !is_array($post_category)) { |