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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 |
|---|---|
| 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; |
| 518 | |
| 519 | // Make sure we set a valid category |