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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 |
|---|---|
| 942 | $post_type = get_post_type_object( 'attachment' ); |
| 943 | $states = 'inherit'; |
| 944 | if ( current_user_can( $post_type->cap->read_private_posts ) ) |
| 945 | $states .= ',private'; |
| 946 | |
| 947 | $q['post_status'] = isset( $q['status'] ) && 'trash' == $q['status'] ? 'trash' : $states; |
| 948 | $media_per_page = (int) get_user_option( 'upload_per_page' ); |
| 949 | if ( empty( $media_per_page ) || $media_per_page < 1 ) |
| 950 | $media_per_page = 20; |
| 951 | $q['posts_per_page'] = apply_filters( 'upload_per_page', $media_per_page ); |
| 952 | |
| 953 | $post_mime_types = get_post_mime_types(); |
| 954 | $avail_post_mime_types = get_available_post_mime_types('attachment'); |
| 955 | |
| 956 | if ( isset($q['post_mime_type']) && !array_intersect( (array) $q['post_mime_type'], array_keys($post_mime_types) ) ) |
| 957 | unset($q['post_mime_type']); |
| 958 | |
| 959 | if ( isset($q['detached']) ) |
| 960 | add_filter('posts_where', '_edit_attachments_query_helper'); |