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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 |
|---|---|
| 3859 | $post_id = (int) $post_id; |
| 3860 | if ( !$post =& get_post( $post_id ) ) |
| 3861 | return false; |
| 3862 | |
| 3863 | $data = get_post_meta( $post->ID, '_wp_attachment_metadata', true ); |
| 3864 | |
| 3865 | if ( $unfiltered ) |
| 3866 | return $data; |
| 3867 | |
| 3868 | return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID ); |
| 3869 | } |
| 3870 | |
| 3871 | /** |
| 3872 | * Update metadata for an attachment. |
| 3873 | * |
| 3874 | * @since 2.1.0 |
| 3875 | * |
| 3876 | * @param int $post_id Attachment ID. |
| 3877 | * @param array $data Attachment data. |