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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 |
|---|---|
| 3873 | * @param int $post_id Attachment ID. |
| 3874 | * @param array $data Attachment data. |
| 3875 | * @return int |
| 3876 | */ |
| 3877 | function wp_update_attachment_metadata( $post_id, $data ) { |
| 3878 | $post_id = (int) $post_id; |
| 3879 | if ( !$post =& get_post( $post_id ) ) |
| 3880 | return false; |
| 3881 | |
| 3882 | $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ); |
| 3883 | |
| 3884 | return update_post_meta( $post->ID, '_wp_attachment_metadata', $data); |
| 3885 | } |
| 3886 | |
| 3887 | /** |
| 3888 | * Retrieve the URL for an attachment. |
| 3889 | * |
| 3890 | * @since 2.1.0 |
| 3891 | * |