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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 |
|---|---|
| 5058 | /** |
| 5059 | * Filters the attachment meta data. |
| 5060 | * |
| 5061 | * @since 2.1.0 |
| 5062 | * |
| 5063 | * @param array|bool $data Array of meta data for the given attachment, or false |
| 5064 | * if the object does not exist. |
| 5065 | * @param int $attachment_id Attachment post ID. |
| 5066 | */ |
| 5067 | return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID ); |
| 5068 | } |
| 5069 | |
| 5070 | /** |
| 5071 | * Update metadata for an attachment. |
| 5072 | * |
| 5073 | * @since 2.1.0 |
| 5074 | * |
| 5075 | * @param int $attachment_id Attachment post ID. |
| 5076 | * @param array $data Attachment meta data. |