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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 |
|---|---|
| 2927 | $post_id = (int) $post_id; |
| 2928 | if ( !$post =& get_post( $post_id ) ) |
| 2929 | return false; |
| 2930 | |
| 2931 | $data = get_post_meta( $post->ID, '_wp_attachment_metadata', true ); |
| 2932 | |
| 2933 | if ( $unfiltered ) |
| 2934 | return $data; |
| 2935 | |
| 2936 | return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID ); |
| 2937 | } |
| 2938 | |
| 2939 | /** |
| 2940 | * Update metadata for an attachment. |
| 2941 | * |
| 2942 | * @since 2.1.0 |
| 2943 | * |
| 2944 | * @param int $post_id Attachment ID. |
| 2945 | * @param array $data Attachment data. |