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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 |
|---|---|
| 2 | |
| 3 | // |
| 4 | // Post functions |
| 5 | // |
| 6 | |
| 7 | function get_attached_file( $attachment_id, $unfiltered = false ) { |
| 8 | $file = get_post_meta( $attachment_id, '_wp_attached_file', true ); |
| 9 | if ( $unfiltered ) |
| 10 | return $file; |
| 11 | return apply_filters( 'get_attached_file', $file, $attachment_id ); |
| 12 | } |
| 13 | |
| 14 | function update_attached_file( $attachment_id, $file ) { |
| 15 | if ( !get_post( $attachment_id ) ) |
| 16 | return false; |
| 17 | |
| 18 | $old_file = get_attached_file( $attachment_id, true ); |
| 19 | |
| 20 | $file = apply_filters( 'update_attached_file', $file, $attachment_id ); |