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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 |
|---|---|
| 4938 | |
| 4939 | /** |
| 4940 | * Filter the updated attachment meta data. |
| 4941 | * |
| 4942 | * @since 2.1.0 |
| 4943 | * |
| 4944 | * @param array $data Array of updated attachment meta data. |
| 4945 | * @param int $post_id Attachment ID. |
| 4946 | */ |
| 4947 | if ( $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ) ) |
| 4948 | return update_post_meta( $post->ID, '_wp_attachment_metadata', $data ); |
| 4949 | else |
| 4950 | return delete_post_meta( $post->ID, '_wp_attachment_metadata' ); |
| 4951 | } |
| 4952 | |
| 4953 | /** |
| 4954 | * Retrieve the URL for an attachment. |
| 4955 | * |
| 4956 | * @since 2.1.0 |