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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 |
|---|---|
| 2875 | } |
| 2876 | |
| 2877 | $post = get_post( $id, ARRAY_A ); |
| 2878 | |
| 2879 | if ( 'attachment' != $post['post_type'] ) { |
| 2880 | wp_send_json_error(); |
| 2881 | } |
| 2882 | |
| 2883 | /** This filter is documented in wp-admin/includes/media.php */ |
| 2884 | $post = apply_filters( 'attachment_fields_to_save', $post, $attachment_data ); |
| 2885 | |
| 2886 | if ( isset( $post['errors'] ) ) { |
| 2887 | $errors = $post['errors']; // @todo return me and display me! |
| 2888 | unset( $post['errors'] ); |
| 2889 | } |
| 2890 | |
| 2891 | wp_update_post( $post ); |
| 2892 | |
| 2893 | foreach ( get_attachment_taxonomies( $post ) as $taxonomy ) { |