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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 |
|---|---|
| 1905 | |
| 1906 | if ( ! current_user_can( 'edit_post', $id ) ) |
| 1907 | wp_send_json_error(); |
| 1908 | |
| 1909 | $post = get_post( $id, ARRAY_A ); |
| 1910 | |
| 1911 | if ( 'attachment' != $post['post_type'] ) |
| 1912 | wp_send_json_error(); |
| 1913 | |
| 1914 | $post = apply_filters( 'attachment_fields_to_save', $post, $attachment_data ); |
| 1915 | |
| 1916 | if ( isset( $post['errors'] ) ) { |
| 1917 | $errors = $post['errors']; // @todo return me and display me! |
| 1918 | unset( $post['errors'] ); |
| 1919 | } |
| 1920 | |
| 1921 | wp_update_post( $post ); |
| 1922 | |
| 1923 | foreach ( get_attachment_taxonomies( $post ) as $taxonomy ) { |