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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 |
|---|---|
| 888 | } else { |
| 889 | $order = 'DESC'; |
| 890 | $orderby = 'date'; |
| 891 | } |
| 892 | |
| 893 | $per_page = 'edit_' . $post_type . '_per_page'; |
| 894 | $posts_per_page = (int) get_user_option( $per_page ); |
| 895 | if ( empty( $posts_per_page ) || $posts_per_page < 1 ) |
| 896 | $posts_per_page = 15; |
| 897 | $posts_per_page = apply_filters( $per_page, $posts_per_page ); |
| 898 | |
| 899 | |
| 900 | $query = compact('post_type', 'post_status', 'perm', 'order', 'orderby', 'posts_per_page'); |
| 901 | |
| 902 | // Hierarchical types require special args. |
| 903 | if ( is_post_type_hierarchical( $post_type ) ) { |
| 904 | $query['orderby'] = 'menu_order title'; |
| 905 | $query['order'] = 'asc'; |
| 906 | $query['posts_per_page'] = -1; |