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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 |
|---|---|
| 51 | /** |
| 52 | * Filter the export filename. |
| 53 | * |
| 54 | * @since 4.4.0 |
| 55 | * |
| 56 | * @param string $wp_filename The name of the file for download. |
| 57 | * @param string $sitename The site name. |
| 58 | * @param string $date Today's date, formatted. |
| 59 | */ |
| 60 | $filename = apply_filters( 'export_wp_filename', $wp_filename, $sitename, $date ); |
| 61 | |
| 62 | header( 'Content-Description: File Transfer' ); |
| 63 | header( 'Content-Disposition: attachment; filename=' . $filename ); |
| 64 | header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ), true ); |
| 65 | |
| 66 | if ( 'all' != $args['content'] && post_type_exists( $args['content'] ) ) { |
| 67 | $ptype = get_post_type_object( $args['content'] ); |
| 68 | if ( ! $ptype->can_export ) |
| 69 | $args['content'] = 'post'; |