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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 |
|---|---|
| 335 | foreach ( $blah as $category ) { |
| 336 | $category = intval($category); |
| 337 | $sql_cat_ids = " OR pc.category_ID = '$category'"; |
| 338 | } |
| 339 | $posts_in_ex_cats = $wpdb->get_col("SELECT p.ID FROM $wpdb->posts p LEFT JOIN $wpdb->post2cat pc ON pc.post_id=p.ID WHERE 1 = 0 $sql_cat_ids GROUP BY p.ID"); |
| 340 | $posts_in_ex_cats_sql = 'AND ID NOT IN (' . implode($posts_in_ex_cats, ',') . ')'; |
| 341 | } |
| 342 | |
| 343 | $join = apply_filters( 'get_previous_post_join', $join, $in_same_cat, $excluded_categories ); |
| 344 | $where = apply_filters( 'get_previous_post_where', "WHERE post_date < '$current_post_date' AND post_type = 'post' AND post_status = 'publish' $posts_in_ex_cats_sql", $in_same_cat, $excluded_categories ); |
| 345 | $sort = apply_filters( 'get_previous_post_sort', 'ORDER BY post_date DESC LIMIT 1' ); |
| 346 | |
| 347 | return @$wpdb->get_row("SELECT ID, post_title FROM $wpdb->posts $join $where $sort"); |
| 348 | } |
| 349 | |
| 350 | function get_next_post($in_same_cat = false, $excluded_categories = '') { |
| 351 | global $post, $wpdb; |
| 352 | |
| 353 | if( !is_single() || is_attachment() ) |