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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 |
---|---|
6357 |
|
6358 | /** |
6359 | * Filters the updated attachment meta data. |
6360 | * |
6361 | * @since 2.1.0 |
6362 | * |
6363 | * @param array $data Array of updated attachment meta data. |
6364 | * @param int $attachment_id Attachment post ID. |
6365 | */ |
6366 | $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ); |
6367 | if ( $data ) { |
6368 | return update_post_meta( $post->ID, '_wp_attachment_metadata', $data ); |
6369 | } else { |
6370 | return delete_post_meta( $post->ID, '_wp_attachment_metadata' ); |
6371 | } |
6372 | } |
6373 |
|
6374 | /** |
6375 | * Retrieve the URL for an attachment. |