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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 |
|---|---|
| 3549 | * @param int $post_id Attachment ID. |
| 3550 | * @param array $data Attachment data. |
| 3551 | * @return int |
| 3552 | */ |
| 3553 | function wp_update_attachment_metadata( $post_id, $data ) { |
| 3554 | $post_id = (int) $post_id; |
| 3555 | if ( !$post =& get_post( $post_id ) ) |
| 3556 | return false; |
| 3557 | |
| 3558 | $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ); |
| 3559 | |
| 3560 | return update_post_meta( $post->ID, '_wp_attachment_metadata', $data); |
| 3561 | } |
| 3562 | |
| 3563 | /** |
| 3564 | * Retrieve the URL for an attachment. |
| 3565 | * |
| 3566 | * @since 2.1.0 |
| 3567 | * |