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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 |
---|---|
499 | $post = & get_post($ID); |
500 | $previous_status = $post->post_status; |
501 | } |
502 |
|
503 | // Get the basics. |
504 | if ( empty($no_filter) ) { |
505 | $post_content = apply_filters('content_save_pre', $post_content); |
506 | $post_content_filtered = apply_filters('content_filtered_save_pre', $post_content_filtered); |
507 | $post_excerpt = apply_filters('excerpt_save_pre', $post_excerpt); |
508 | $post_title = apply_filters('title_save_pre', $post_title); |
509 | $post_category = apply_filters('category_save_pre', $post_category); |
510 | $post_status = apply_filters('status_save_pre', $post_status); |
511 | $post_name = apply_filters('name_save_pre', $post_name); |
512 | $comment_status = apply_filters('comment_status_pre', $comment_status); |
513 | $ping_status = apply_filters('ping_status_pre', $ping_status); |
514 | } |
515 |
|
516 | if ( ('' == $post_content) && ('' == $post_title) && ('' == $post_excerpt) ) |
517 | return 0; |
Line | Code |
1221 | $object = get_object_vars($object); |
1222 |
|
1223 | // Export array as variables |
1224 | extract($object); |
1225 |
|
1226 | // Get the basics. |
1227 | $post_content = apply_filters('content_save_pre', $post_content); |
1228 | $post_content_filtered = apply_filters('content_filtered_save_pre', $post_content_filtered); |
1229 | $post_excerpt = apply_filters('excerpt_save_pre', $post_excerpt); |
1230 | $post_title = apply_filters('title_save_pre', $post_title); |
1231 | $post_category = apply_filters('category_save_pre', $post_category); |
1232 | $post_name = apply_filters('name_save_pre', $post_name); |
1233 | $comment_status = apply_filters('comment_status_pre', $comment_status); |
1234 | $ping_status = apply_filters('ping_status_pre', $ping_status); |
1235 | $post_mime_type = apply_filters('post_mime_type_pre', $post_mime_type); |
1236 |
|
1237 | // Make sure we set a valid category |
1238 | if (0 == count($post_category) || !is_array($post_category)) { |
1239 | $post_category = array(get_option('default_category')); |