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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 |
|---|---|
| 5751 | /** |
| 5752 | * Filters the attachment meta data. |
| 5753 | * |
| 5754 | * @since 2.1.0 |
| 5755 | * |
| 5756 | * @param array|bool $data Array of meta data for the given attachment, or false |
| 5757 | * if the object does not exist. |
| 5758 | * @param int $attachment_id Attachment post ID. |
| 5759 | */ |
| 5760 | return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID ); |
| 5761 | } |
| 5762 | |
| 5763 | /** |
| 5764 | * Update metadata for an attachment. |
| 5765 | * |
| 5766 | * @since 2.1.0 |
| 5767 | * |
| 5768 | * @param int $attachment_id Attachment post ID. |
| 5769 | * @param array $data Attachment meta data. |