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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 |
|---|---|
| 979 | |
| 980 | /** |
| 981 | * Filter the number of posts displayed per page when specifically listing "posts". |
| 982 | * |
| 983 | * @since 2.8.0 |
| 984 | * |
| 985 | * @param int $posts_per_page Number of posts to be displayed. Default 20. |
| 986 | * @param string $post_type The post type. |
| 987 | */ |
| 988 | $posts_per_page = apply_filters( 'edit_posts_per_page', $posts_per_page, $post_type ); |
| 989 | |
| 990 | $query = compact('post_type', 'post_status', 'perm', 'order', 'orderby', 'posts_per_page'); |
| 991 | |
| 992 | // Hierarchical types require special args. |
| 993 | if ( is_post_type_hierarchical( $post_type ) && !isset($orderby) ) { |
| 994 | $query['orderby'] = 'menu_order title'; |
| 995 | $query['order'] = 'asc'; |
| 996 | $query['posts_per_page'] = -1; |
| 997 | $query['posts_per_archive_page'] = -1; |