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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 |
|---|---|
| 6100 | /** |
| 6101 | * Filters the attachment meta data. |
| 6102 | * |
| 6103 | * @since 2.1.0 |
| 6104 | * |
| 6105 | * @param array|bool $data Array of meta data for the given attachment, or false |
| 6106 | * if the object does not exist. |
| 6107 | * @param int $attachment_id Attachment post ID. |
| 6108 | */ |
| 6109 | return apply_filters( 'wp_get_attachment_metadata', $data, $attachment_id ); |
| 6110 | } |
| 6111 | |
| 6112 | /** |
| 6113 | * Updates metadata for an attachment. |
| 6114 | * |
| 6115 | * @since 2.1.0 |
| 6116 | * |
| 6117 | * @param int $attachment_id Attachment post ID. |
| 6118 | * @param array $data Attachment meta data. |