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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 |
|---|---|
| 1 | <?php |
| 2 | |
| 3 | // version number for the export format. bump this when something changes that might affect compatibility. |
| 4 | define('WXR_VERSION', '1.0'); |
| 5 | |
| 6 | function export_wp($author='') { |
| 7 | global $wpdb, $post_ids, $post; |
| 8 | |
| 9 | do_action('export_wp'); |
| 10 | |
| 11 | $filename = 'wordpress.' . date('Y-m-d') . '.xml'; |
| 12 | |
| 13 | header('Content-Description: File Transfer'); |
| 14 | header("Content-Disposition: attachment; filename=$filename"); |
| 15 | header('Content-Type: text/xml; charset=' . get_option('blog_charset'), true); |
| 16 | |
| 17 | $where = ''; |
| 18 | if ( $author and $author != 'all' ) { |