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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 |
|---|---|
| 4804 | /** |
| 4805 | * Filter the attachment meta data. |
| 4806 | * |
| 4807 | * @since 2.1.0 |
| 4808 | * |
| 4809 | * @param array|bool $data Array of meta data for the given attachment, or false |
| 4810 | * if the object does not exist. |
| 4811 | * @param int $post_id Attachment ID. |
| 4812 | */ |
| 4813 | return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID ); |
| 4814 | } |
| 4815 | |
| 4816 | /** |
| 4817 | * Update metadata for an attachment. |
| 4818 | * |
| 4819 | * @since 2.1.0 |
| 4820 | * |
| 4821 | * @param int $post_id Attachment ID. |
| 4822 | * @param array $data Attachment data. |