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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.
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34 | $args = wp_parse_args( $args, $defaults ); |
35 |
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36 | /** |
37 | * Fires at the beginning of an export, before any headers are sent. |
38 | * |
39 | * @since 2.3.0 |
40 | * |
41 | * @param array $args An array of export arguments. |
42 | */ |
43 | do_action( 'export_wp', $args ); |
44 |
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45 | $sitename = sanitize_key( get_bloginfo( 'name' ) ); |
46 | if ( ! empty($sitename) ) $sitename .= '.'; |
47 | $filename = $sitename . 'wordpress.' . date( 'Y-m-d' ) . '.xml'; |
48 |
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49 | header( 'Content-Description: File Transfer' ); |
50 | header( 'Content-Disposition: attachment; filename=' . $filename ); |
51 | header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ), true ); |
52 |
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