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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 |
|---|---|
| 4737 | /** |
| 4738 | * Filter the attachment meta data. |
| 4739 | * |
| 4740 | * @since 2.1.0 |
| 4741 | * |
| 4742 | * @param array|bool $data Array of meta data for the given attachment, or false |
| 4743 | * if the object does not exist. |
| 4744 | * @param int $post_id Attachment ID. |
| 4745 | */ |
| 4746 | return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID ); |
| 4747 | } |
| 4748 | |
| 4749 | /** |
| 4750 | * Update metadata for an attachment. |
| 4751 | * |
| 4752 | * @since 2.1.0 |
| 4753 | * |
| 4754 | * @param int $post_id Attachment ID. |
| 4755 | * @param array $data Attachment data. |