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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 |
|---|---|
| 28 | |
| 29 | if ( ! is_array( $args ) ) |
| 30 | $args = array( 'author' => $args ); |
| 31 | |
| 32 | $defaults = array( 'author' => null, 'taxonomy' => null, 'post_type' => null, 'post_status' => null, 'start_date' => null, 'end_date' => null ); |
| 33 | $args = wp_parse_args( $args, $defaults ); |
| 34 | |
| 35 | extract($args); |
| 36 | |
| 37 | do_action('export_wp'); |
| 38 | |
| 39 | if( strlen( $start_date ) > 4 && strlen( $end_date ) > 4 ) |
| 40 | $filename = 'wordpress.' . $start_date . '.' . $end_date . '.xml'; |
| 41 | else |
| 42 | $filename = 'wordpress.' . date( 'Y-m-d' ) . '.xml'; |
| 43 | |
| 44 | header( 'Content-Description: File Transfer' ); |
| 45 | header( 'Content-Disposition: attachment; filename=' . $filename ); |
| 46 | header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ), true ); |