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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 |
|---|---|
| 4857 | /** |
| 4858 | * Filters the attachment meta data. |
| 4859 | * |
| 4860 | * @since 2.1.0 |
| 4861 | * |
| 4862 | * @param array|bool $data Array of meta data for the given attachment, or false |
| 4863 | * if the object does not exist. |
| 4864 | * @param int $post_id Attachment ID. |
| 4865 | */ |
| 4866 | return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID ); |
| 4867 | } |
| 4868 | |
| 4869 | /** |
| 4870 | * Update metadata for an attachment. |
| 4871 | * |
| 4872 | * @since 2.1.0 |
| 4873 | * |
| 4874 | * @param int $post_id Attachment ID. |
| 4875 | * @param array $data Attachment data. |