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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 |
|---|---|
| 31 | $args = wp_parse_args( $args, $defaults ); |
| 32 | |
| 33 | /** |
| 34 | * Fires at the beginning of an export, before any headers are sent. |
| 35 | * |
| 36 | * @since 2.3.0 |
| 37 | * |
| 38 | * @param array $args An array of export arguments. |
| 39 | */ |
| 40 | do_action( 'export_wp', $args ); |
| 41 | |
| 42 | $sitename = sanitize_key( get_bloginfo( 'name' ) ); |
| 43 | if ( ! empty($sitename) ) $sitename .= '.'; |
| 44 | $filename = $sitename . 'wordpress.' . date( 'Y-m-d' ) . '.xml'; |
| 45 | |
| 46 | header( 'Content-Description: File Transfer' ); |
| 47 | header( 'Content-Disposition: attachment; filename=' . $filename ); |
| 48 | header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ), true ); |
| 49 | |