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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 |
|---|---|
| 5546 | /** |
| 5547 | * Filters the attachment meta data. |
| 5548 | * |
| 5549 | * @since 2.1.0 |
| 5550 | * |
| 5551 | * @param array|bool $data Array of meta data for the given attachment, or false |
| 5552 | * if the object does not exist. |
| 5553 | * @param int $attachment_id Attachment post ID. |
| 5554 | */ |
| 5555 | return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID ); |
| 5556 | } |
| 5557 | |
| 5558 | /** |
| 5559 | * Update metadata for an attachment. |
| 5560 | * |
| 5561 | * @since 2.1.0 |
| 5562 | * |
| 5563 | * @param int $attachment_id Attachment post ID. |
| 5564 | * @param array $data Attachment meta data. |