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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 |
|---|---|
| 5084 | |
| 5085 | /** |
| 5086 | * Filters the updated attachment meta data. |
| 5087 | * |
| 5088 | * @since 2.1.0 |
| 5089 | * |
| 5090 | * @param array $data Array of updated attachment meta data. |
| 5091 | * @param int $attachment_id Attachment post ID. |
| 5092 | */ |
| 5093 | if ( $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ) ) |
| 5094 | return update_post_meta( $post->ID, '_wp_attachment_metadata', $data ); |
| 5095 | else |
| 5096 | return delete_post_meta( $post->ID, '_wp_attachment_metadata' ); |
| 5097 | } |
| 5098 | |
| 5099 | /** |
| 5100 | * Retrieve the URL for an attachment. |
| 5101 | * |
| 5102 | * @since 2.1.0 |