export_wp()
概述
export_wp() 函数用于生成 WordPress 导出文件（WXR 格式），支持按内容类型、作者、分类、日期等参数筛选导出内容。默认导出所有启用了 can_export 参数的文章类型，并自动跳过状态为 'auto-draft' 的文章。
关键要点
- 函数生成 WXR 格式的 XML 文件，用于 WordPress 内容导出。
- 支持参数包括 content（内容类型）、author（作者）、category（分类）、start_date（开始日期）、end_date（结束日期）和 status（文章状态）。
- 导出内容受 can_export 参数限制，无效或未启用的自定义文章类型会回退到默认导出。
- 包含多个辅助函数（如 wxr_cdata、wxr_site_url）用于处理 XML 输出和数据结构。
- 提供多个 Hook（如 export_wp、export_wp_filename）允许开发者在导出过程中自定义行为。
代码示例
function export_wp( $args = array() ) {
global $wpdb, $post;
$defaults = array(
'content' => 'all',
'author' => false,
'category' => false,
'start_date' => false,
'end_date' => false,
'status' => false,
);
$args = wp_parse_args( $args, $defaults );
do_action( 'export_wp', $args );
// 生成文件名和设置 HTTP 头
$sitename = sanitize_key( get_bloginfo( 'name' ) );
if ( ! empty( $sitename ) ) {
$sitename .= '.';
}
$date = gmdate( 'Y-m-d' );
$wp_filename = $sitename . 'WordPress.' . $date . '.xml';
$filename = apply_filters( 'export_wp_filename', $wp_filename, $sitename, $date );
header( 'Content-Description: File Transfer' );
header( 'Content-Disposition: attachment; filename=' . $filename );
header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ), true );
// 构建查询条件
if ( 'all' !== $args['content'] && post_type_exists( $args['content'] ) ) {
$ptype = get_post_type_object( $args['content'] );
if ( ! $ptype->can_export ) {
$args['content'] = 'post';
}
$where = $wpdb->prepare( "{$wpdb->posts}.post_type = %s", $args['content'] );
} else {
$post_types = get_post_types( array( 'can_export' => true ) );
$esses = array_fill( 0, count( $post_types ), '%s' );
$where = $wpdb->prepare( "{$wpdb->posts}.post_type IN (" . implode( ',', $esses ) . ')", $post_types );
}
if ( $args['status'] && ( 'post' === $args['content'] || 'page' === $args['content'] ) ) {
$where .= $wpdb->prepare( " AND {$wpdb->posts}.post_status = %s", $args['status'] );
} else {
$where .= " AND {$wpdb->posts}.post_status != 'auto-draft'";
}
// 更多查询逻辑和输出处理...
}注意事项
- 导出文件为 XML 格式，包含文章、页面、附件、分类、标签、自定义文章类型和元数据。
- 使用 wpdb 类进行数据库查询，确保 SQL 注入防护。
- 导出过程中会触发多个 Hook，允许开发者自定义文件名、跳过特定元数据等。
- 函数内部处理了多站点环境和附件导出逻辑。
Generates the WXR export file for download.
Description
Default behavior is to export all content, however, note that post content will only be exported for post types with the can_export argument enabled. Any posts with the ‘auto-draft’ status will be skipped.
Parameters
$argsarrayoptional-
Arguments for generating the WXR export file for download.
contentstringType of content to export. If set, only the post content of this post type will be exported. Accepts'all','post','page','attachment', or a defined custom post. If an invalid custom post type is supplied, every post type for whichcan_exportis enabled will be exported instead. If a valid custom post type is supplied butcan_exportis disabled, then'posts'will be exported instead. When'all'is supplied, only post types withcan_exportenabled will be exported. Default'all'.authorstringAuthor to export content for. Only used when$contentis'post','page', or'attachment'. Accepts false (all) or a specific author ID. Default false (all).categorystringCategory (slug) to export content for. Used only when$contentis'post'. If set, only post content assigned to$categorywill be exported. Accepts false or a specific category slug. Default is false (all categories).start_datestringStart date to export content from. Expected date format is'Y-m-d'. Used only when$contentis'post','page'or'attachment'. Default false (since the beginning of time).end_datestringEnd date to export content to. Expected date format is'Y-m-d'. Used only when$contentis'post','page'or'attachment'. Default false (latest publish date).statusstringPost status to export posts for. Used only when$contentis'post'or'page'.
Accepts false (all statuses except'auto-draft'), or a specific status, i.e.
'publish','pending','draft','auto-draft','future','private','inherit', or'trash'. Default false (all statuses except'auto-draft').
Default:
array()
Source
function export_wp( $args = array() ) {
global $wpdb, $post;
$defaults = array(
'content' => 'all',
'author' => false,
'category' => false,
'start_date' => false,
'end_date' => false,
'status' => false,
);
$args = wp_parse_args( $args, $defaults );
/**
* Fires at the beginning of an export, before any headers are sent.
*
* @since 2.3.0
*
* @param array $args An array of export arguments.
*/
do_action( 'export_wp', $args );
$sitename = sanitize_key( get_bloginfo( 'name' ) );
if ( ! empty( $sitename ) ) {
$sitename .= '.';
}
$date = gmdate( 'Y-m-d' );
$wp_filename = $sitename . 'WordPress.' . $date . '.xml';
/**
* Filters the export filename.
*
* @since 4.4.0
*
* @param string $wp_filename The name of the file for download.
* @param string $sitename The site name.
* @param string $date Today's date, formatted.
*/
$filename = apply_filters( 'export_wp_filename', $wp_filename, $sitename, $date );
header( 'Content-Description: File Transfer' );
header( 'Content-Disposition: attachment; filename=' . $filename );
header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ), true );
if ( 'all' !== $args['content'] && post_type_exists( $args['content'] ) ) {
$ptype = get_post_type_object( $args['content'] );
if ( ! $ptype->can_export ) {
$args['content'] = 'post';
}
$where = $wpdb->prepare( "{$wpdb->posts}.post_type = %s", $args['content'] );
} else {
$post_types = get_post_types( array( 'can_export' => true ) );
$esses = array_fill( 0, count( $post_types ), '%s' );
// phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare
$where = $wpdb->prepare( "{$wpdb->posts}.post_type IN (" . implode( ',', $esses ) . ')', $post_types );
}
if ( $args['status'] && ( 'post' === $args['content'] || 'page' === $args['content'] ) ) {
$where .= $wpdb->prepare( " AND {$wpdb->posts}.post_status = %s", $args['status'] );
} else {
$where .= " AND {$wpdb->posts}.post_status != 'auto-draft'";
}
$join = '';
if ( $args['category'] && 'post' === $args['content'] ) {
$term = term_exists( $args['category'], 'category' );
if ( $term ) {
$join = "INNER JOIN {$wpdb->term_relationships} ON ({$wpdb->posts}.ID = {$wpdb->term_relationships}.object_id)";
$where .= $wpdb->prepare( " AND {$wpdb->term_relationships}.term_taxonomy_id = %d", $term['term_taxonomy_id'] );
}
}
if ( in_array( $args['content'], array( 'post', 'page', 'attachment' ), true ) ) {
if ( $args['author'] ) {
$where .= $wpdb->prepare( " AND {$wpdb->posts}.post_author = %d", $args['author'] );
}
if ( $args['start_date'] ) {
$where .= $wpdb->prepare( " AND {$wpdb->posts}.post_date >= %s", gmdate( 'Y-m-d', strtotime( $args['start_date'] ) ) );
}
if ( $args['end_date'] ) {
$where .= $wpdb->prepare( " AND {$wpdb->posts}.post_date < %s", gmdate( 'Y-m-d', strtotime( '+1 month', strtotime( $args['end_date'] ) ) ) );
}
}
// Grab a snapshot of post IDs, just in case it changes during the export.
$post_ids = $wpdb->get_col( "SELECT ID FROM {$wpdb->posts} $join WHERE $where" );
// Get IDs for the attachments of each post, unless all content is already being exported.
if ( ! in_array( $args['content'], array( 'all', 'attachment' ), true ) ) {
// Array to hold all additional IDs (attachments and thumbnails).
$additional_ids = array();
// Create a copy of the post IDs array to avoid modifying the original array.
$processing_ids = $post_ids;
while ( $next_posts = array_splice( $processing_ids, 0, 20 ) ) {
$posts_in = array_map( 'absint', $next_posts );
$placeholders = array_fill( 0, count( $posts_in ), '%d' );
// Create a string for the placeholders.
$in_placeholder = implode( ',', $placeholders );
// Prepare the SQL statement for attachment ids.
$attachment_ids = $wpdb->get_col(
$wpdb->prepare(
"
SELECT ID
FROM $wpdb->posts
WHERE post_parent IN ($in_placeholder) AND post_type = 'attachment'
",
$posts_in
)
);
$thumbnails_ids = $wpdb->get_col(
$wpdb->prepare(
"
SELECT meta_value
FROM $wpdb->postmeta
WHERE $wpdb->postmeta.post_id IN ($in_placeholder)
AND $wpdb->postmeta.meta_key = '_thumbnail_id'
",
$posts_in
)
);
$additional_ids = array_merge( $additional_ids, $attachment_ids, $thumbnails_ids );
}
// Merge the additional IDs back with the original post IDs after processing all posts
$post_ids = array_unique( array_merge( $post_ids, $additional_ids ) );
}
/*
* Get the requested terms ready, empty unless posts filtered by category
* or all content.
*/
$cats = array();
$tags = array();
$terms = array();
if ( isset( $term ) && $term ) {
$cat = get_term( $term['term_id'], 'category' );
$cats = array( $cat->term_id => $cat );
unset( $term, $cat );
} elseif ( 'all' === $args['content'] ) {
$categories = (array) get_categories( array( 'get' => 'all' ) );
$tags = (array) get_tags( array( 'get' => 'all' ) );
$custom_taxonomies = get_taxonomies( array( '_builtin' => false ) );
$custom_terms = (array) get_terms(
array(
'taxonomy' => $custom_taxonomies,
'get' => 'all',
)
);
// Put categories in order with no child going before its parent.
while ( $cat = array_shift( $categories ) ) {
if ( ! $cat->parent || isset( $cats[ $cat->parent ] ) ) {
$cats[ $cat->term_id ] = $cat;
} else {
$categories[] = $cat;
}
}
// Put terms in order with no child going before its parent.
while ( $t = array_shift( $custom_terms ) ) {
if ( ! $t->parent || isset( $terms[ $t->parent ] ) ) {
$terms[ $t->term_id ] = $t;
} else {
$custom_terms[] = $t;
}
}
unset( $categories, $custom_taxonomies, $custom_terms );
}
/**
* Wraps given string in XML CDATA tag.
*
* @since 2.1.0
*
* @param string|null $str String to wrap in XML CDATA tag. May be null.
* @return string
*/
function wxr_cdata( $str ) {
$str = (string) $str;
if ( ! wp_is_valid_utf8( $str ) ) {
$str = utf8_encode( $str );
}
// $str = ent2ncr(esc_html($str));
$str = '', ']]]]>';
return $str;
}
/**
* Returns the URL of the site.
*
* @since 2.5.0
*
* @return string Site URL.
*/
function wxr_site_url() {
if ( is_multisite() ) {
// Multisite: the base URL.
return network_home_url();
} else {
// WordPress (single site): the site URL.
return get_bloginfo_rss( 'url' );
}
}
/**
* Outputs a cat_name XML tag from a given category object.
*
* @since 2.1.0
*
* @param WP_Term $category Category Object.
*/
function wxr_cat_name( $category ) {
if ( empty( $category->name ) ) {
return;
}
echo '<wp:cat_name>' . wxr_cdata( $category->name ) . "</wp:cat_name>n";
}
/**
* Outputs a category_description XML tag from a given category object.
*
* @since 2.1.0
*
* @param WP_Term $category Category Object.
*/
function wxr_category_description( $category ) {
if ( empty( $category->description ) ) {
return;
}
echo '<wp:category_description>' . wxr_cdata( $category->description ) . "</wp:category_description>n";
}
/**
* Outputs a tag_name XML tag from a given tag object.
*
* @since 2.3.0
*
* @param WP_Term $tag Tag Object.
*/
function wxr_tag_name( $tag ) {
if ( empty( $tag->name ) ) {
return;
}
echo '<wp:tag_name>' . wxr_cdata( $tag->name ) . "</wp:tag_name>n";
}
/**
* Outputs a tag_description XML tag from a given tag object.
*
* @since 2.3.0
*
* @param WP_Term $tag Tag Object.
*/
function wxr_tag_description( $tag ) {
if ( empty( $tag->description ) ) {
return;
}
echo '<wp:tag_description>' . wxr_cdata( $tag->description ) . "</wp:tag_description>n";
}
/**
* Outputs a term_name XML tag from a given term object.
*
* @since 2.9.0
*
* @param WP_Term $term Term Object.
*/
function wxr_term_name( $term ) {
if ( empty( $term->name ) ) {
return;
}
echo '<wp:term_name>' . wxr_cdata( $term->name ) . "</wp:term_name>n";
}
/**
* Outputs a term_description XML tag from a given term object.
*
* @since 2.9.0
*
* @param WP_Term $term Term Object.
*/
function wxr_term_description( $term ) {
if ( empty( $term->description ) ) {
return;
}
echo "tt<wp:term_description>" . wxr_cdata( $term->description ) . "</wp:term_description>n";
}
/**
* Outputs term meta XML tags for a given term object.
*
* @since 4.6.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param WP_Term $term Term object.
*/
function wxr_term_meta( $term ) {
global $wpdb;
$termmeta = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->termmeta WHERE term_id = %d", $term->term_id ) );
foreach ( $termmeta as $meta ) {
/**
* Filters whether to selectively skip term meta used for WXR exports.
*
* Returning a truthy value from the filter will skip the current meta
* object from being exported.
*
* @since 4.6.0
*
* @param bool $skip Whether to skip the current piece of term meta. Default false.
* @param string $meta_key Current meta key.
* @param object $meta Current meta object.
*/
if ( ! apply_filters( 'wxr_export_skip_termmeta', false, $meta->meta_key, $meta ) ) {
printf( "tt<wp:termmeta>nttt<wp:meta_key>%s</wp:meta_key>nttt<wp:meta_value>%s</wp:meta_value>ntt</wp:termmeta>n", wxr_cdata( $meta->meta_key ), wxr_cdata( $meta->meta_value ) );
}
}
}
/**
* Outputs list of authors with posts.
*
* @since 3.1.0
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param int[] $post_ids Optional. Array of post IDs to filter the query by.
*/
function wxr_authors_list( ?array $post_ids = null ) {
global $wpdb;
if ( ! empty( $post_ids ) ) {
$post_ids = array_map( 'absint', $post_ids );
$post_id_chunks = array_chunk( $post_ids, 20 );
} else {
$post_id_chunks = array( array() );
}
$authors = array();
foreach ( $post_id_chunks as $next_posts ) {
$and = ! empty( $next_posts ) ? 'AND ID IN (' . implode( ', ', $next_posts ) . ')' : '';
$results = $wpdb->get_results( "SELECT DISTINCT post_author FROM $wpdb->posts WHERE post_status != 'auto-draft' $and" );
foreach ( (array) $results as $result ) {
$authors[] = get_userdata( $result->post_author );
}
}
$authors = array_filter( $authors );
$authors = array_unique( $authors, SORT_REGULAR ); // Remove duplicate authors.
foreach ( $authors as $author ) {
echo "t<wp:author>";
echo '<wp:author_id>' . (int) $author->ID . '</wp:author_id>';
echo '<wp:author_login>' . wxr_cdata( $author->user_login ) . '</wp:author_login>';
echo '<wp:author_email>' . wxr_cdata( $author->user_email ) . '</wp:author_email>';
echo '<wp:author_display_name>' . wxr_cdata( $author->display_name ) . '</wp:author_display_name>';
echo '<wp:author_first_name>' . wxr_cdata( $author->first_name ) . '</wp:author_first_name>';
echo '<wp:author_last_name>' . wxr_cdata( $author->last_name ) . '</wp:author_last_name>';
echo "</wp:author>n";
}
}
/**
* Outputs all navigation menu terms.
*
* @since 3.1.0
*/
function wxr_nav_menu_terms() {
$nav_menus = wp_get_nav_menus();
if ( empty( $nav_menus ) || ! is_array( $nav_menus ) ) {
return;
}
foreach ( $nav_menus as $menu ) {
echo "t<wp:term>";
echo '<wp:term_id>' . (int) $menu->term_id . '</wp:term_id>';
echo '<wp:term_taxonomy>nav_menu</wp:term_taxonomy>';
echo '<wp:term_slug>' . wxr_cdata( $menu->slug ) . '</wp:term_slug>';
wxr_term_name( $menu );
echo "</wp:term>n";
}
}
/**
* Outputs list of taxonomy terms, in XML tag format, associated with a post.
*
* @since 2.3.0
*/
function wxr_post_taxonomy() {
$post = get_post();
$taxonomies = get_object_taxonomies( $post->post_type );
if ( empty( $taxonomies ) ) {
return;
}
$terms = wp_get_object_terms( $post->ID, $taxonomies );
foreach ( (array) $terms as $term ) {
echo "tt<category domain="{$term->taxonomy}" nicename="{$term->slug}">" . wxr_cdata( $term->name ) . "</category>n";
}
}
/**
* Determines whether to selectively skip post meta used for WXR exports.
*
* @since 3.3.0
*
* @param bool $return_me Whether to skip the current post meta. Default false.
* @param string $meta_key Meta key.
* @return bool
*/
function wxr_filter_postmeta( $return_me, $meta_key ) {
if ( '_edit_lock' === $meta_key ) {
$return_me = true;
}
return $return_me;
}
add_filter( 'wxr_export_skip_postmeta', 'wxr_filter_postmeta', 10, 2 );
echo 'n";
?>
<!-- This is a WordPress eXtended RSS file generated by WordPress as an export of your site. -->
<!-- It contains information about your site's posts, pages, comments, categories, and other content. -->
<!-- You may use this file to transfer that content from one site to another. -->
<!-- This file is not intended to serve as a complete backup of your site. -->
<!-- To import this information into a WordPress site follow these steps: -->
<!-- 1. Log in to that site as an administrator. -->
<!-- 2. Go to Tools: Import in the WordPress admin panel. -->
<!-- 3. Install the "WordPress" importer from the list. -->
<!-- 4. Activate & Run Importer. -->
<!-- 5. Upload this file using the form provided on that page. -->
<!-- 6. You will first be asked to map the authors in this export file to users -->
<!-- on the site. For each author, you may choose to map to an -->
<!-- existing user on the site or to create a new user. -->
<!-- 7. WordPress will then import each of the posts, pages, comments, categories, etc. -->
<!-- contained in this file into your site. -->
<rss version="2.0"
xmlns:excerpt="https://wordpress.org/export/<?php echo WXR_VERSION; ?>/excerpt/"
xmlns:content="http://purl.org/rss/1.0/modules/content/"
xmlns:wfw="http://wellformedweb.org/CommentAPI/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:wp="https://wordpress.org/export/<?php echo WXR_VERSION; ?>/"
>
<channel>
<title></title>
<link></link>
<description></description>
<pubDate></pubdate>
<language></language>
<wp:wxr_version></wp:wxr_version>
<wp:base_site_url></wp:base_site_url>
<wp:base_blog_url></wp:base_blog_url>
<wp:category>
<wp:term_id>term_id; ?></wp:term_id>
<wp:category_nicename>slug ); ?></wp:category_nicename>
<wp:category_parent>parent ? $cats[ $c->parent ]->slug : '' ); ?></wp:category_parent>
</wp:category>
<wp:tag>
<wp:term_id>term_id; ?></wp:term_id>
<wp:tag_slug>slug ); ?></wp:tag_slug>
</wp:tag>
<wp:term>
<wp:term_id>term_id; ?></wp:term_id>
<wp:term_taxonomy>taxonomy ); ?></wp:term_taxonomy>
<wp:term_slug>slug ); ?></wp:term_slug>
<wp:term_parent>parent ? $terms[ $t->parent ]->slug : '' ); ?></wp:term_parent>
</wp:term>
in_the_loop = true;
// Fetch 20 posts at a time rather than loading the entire table into memory.
while ( $next_posts = array_splice( $post_ids, 0, 20 ) ) {
$where = 'WHERE ID IN (' . implode( ',', $next_posts ) . ')';
$posts = $wpdb->get_results( "SELECT * FROM {$wpdb->posts} $where" );
// Begin Loop.
foreach ( $posts as $post ) {
setup_postdata( $post );
/**
* Filters the post title used for WXR exports.
*
* @since 5.7.0
*
* @param string $post_title Title of the current post.
*/
$title = wxr_cdata( apply_filters( 'the_title_export', $post->post_title ) );
/**
* Filters the post content used for WXR exports.
*
* @since 2.5.0
*
* @param string $post_content Content of the current post.
*/
$content = wxr_cdata( apply_filters( 'the_content_export', $post->post_content ) );
/**
* Filters the post excerpt used for WXR exports.
*
* @since 2.6.0
*
* @param string $post_excerpt Excerpt for the current post.
*/
$excerpt = wxr_cdata( apply_filters( 'the_excerpt_export', $post->post_excerpt ) );
$is_sticky = is_sticky( $post->ID ) ? 1 : 0;
?>
<item>
<title></title>
<link></link>
<pubDate></pubdate>
<dc:creator></dc:creator>
<guid isPermaLink="false"></guid>
<description></description>
<content:encoded></content:encoded>
<excerpt:encoded></excerpt:encoded>
<wp:post_id>ID; ?></wp:post_id>
<wp:post_date>post_date ); ?></wp:post_date>
<wp:post_date_gmt>post_date_gmt ); ?></wp:post_date_gmt>
<wp:post_modified>post_modified ); ?></wp:post_modified>
<wp:post_modified_gmt>post_modified_gmt ); ?></wp:post_modified_gmt>
<wp:comment_status>comment_status ); ?></wp:comment_status>
<wp:ping_status>ping_status ); ?></wp:ping_status>
<wp:post_name>post_name ); ?></wp:post_name>
<wp:status>post_status ); ?></wp:status>
<wp:post_parent>post_parent; ?></wp:post_parent>
<wp:menu_order>menu_order; ?></wp:menu_order>
<wp:post_type>post_type ); ?></wp:post_type>
<wp:post_password>post_password ); ?></wp:post_password>
<wp:is_sticky></wp:is_sticky>
post_type ) : ?>
<wp:attachment_url>ID ) ); ?></wp:attachment_url>
get_results( $wpdb->prepare( "SELECT * FROM $wpdb->postmeta WHERE post_id = %d", $post->ID ) );
foreach ( $postmeta as $meta ) :
/**
* Filters whether to selectively skip post meta used for WXR exports.
*
* Returning a truthy value from the filter will skip the current meta
* object from being exported.
*
* @since 3.3.0
*
* @param bool $skip Whether to skip the current post meta. Default false.
* @param string $meta_key Current meta key.
* @param object $meta Current meta object.
*/
if ( apply_filters( 'wxr_export_skip_postmeta', false, $meta->meta_key, $meta ) ) {
continue;
}
?>
<wp:postmeta>
<wp:meta_key>meta_key ); ?></wp:meta_key>
<wp:meta_value>meta_value ); ?></wp:meta_value>
</wp:postmeta>
get_results( $wpdb->prepare( "SELECT * FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_approved <> 'spam'", $post->ID ) );
$comments = array_map( 'get_comment', $_comments );
foreach ( $comments as $c ) :
?>
<wp:comment>
<wp:comment_id>comment_ID; ?></wp:comment_id>
<wp:comment_author>comment_author ); ?></wp:comment_author>
<wp:comment_author_email>comment_author_email ); ?></wp:comment_author_email>
<wp:comment_author_url>comment_author_url ); ?></wp:comment_author_url>
<wp:comment_author_IP>comment_author_IP ); ?></wp:comment_author_ip>
<wp:comment_date>comment_date ); ?></wp:comment_date>
<wp:comment_date_gmt>comment_date_gmt ); ?></wp:comment_date_gmt>
<wp:comment_content>comment_content ); ?></wp:comment_content>
<wp:comment_approved>comment_approved ); ?></wp:comment_approved>
<wp:comment_type>comment_type ); ?></wp:comment_type>
<wp:comment_parent>comment_parent; ?></wp:comment_parent>
<wp:comment_user_id>user_id; ?></wp:comment_user_id>
get_results( $wpdb->prepare( "SELECT * FROM $wpdb->commentmeta WHERE comment_id = %d", $c->comment_ID ) );
foreach ( $c_meta as $meta ) :
/**
* Filters whether to selectively skip comment meta used for WXR exports.
*
* Returning a truthy value from the filter will skip the current meta
* object from being exported.
*
* @since 4.0.0
*
* @param bool $skip Whether to skip the current comment meta. Default false.
* @param string $meta_key Current meta key.
* @param object $meta Current meta object.
*/
if ( apply_filters( 'wxr_export_skip_commentmeta', false, $meta->meta_key, $meta ) ) {
continue;
}
?>
<wp:commentmeta>
<wp:meta_key>meta_key ); ?></wp:meta_key>
<wp:meta_value>meta_value ); ?></wp:meta_value>
</wp:commentmeta>
</wp:comment>
</item>
</channel>
</rss>
</pre><p class="wporg-dot-link-list"><a href="https://developer.wordpress.org/reference/files/wp-admin/includes/export.php/">View all references</a> <a href="https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-admin/includes/export.php#L57">View on Trac</a> <a href="https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-admin/includes/export.php#L57-L741">View on GitHub</a></p></section>
<section class="wp-block-wporg-code-reference-hooks"><h2 id="hooks" class="is-toc-heading wp-block-heading has-heading-5-font-size" tabindex="-1" ><a href="#hooks">Hooks</a></h2> <dl><dt class="wp-block-wporg-code-reference-title has-normal-font-size"><a href="https://developer.wordpress.org/reference/hooks/export_wp/"><span class="hook-func">do_action</span>( ‘export_wp’, <nobr><span class="arg-type">array</span> <span class="arg-name">$args</span></nobr> )</a></dt><dd><p>Fires at the beginning of an export, before any headers are sent.</p>
</dd><dt class="wp-block-wporg-code-reference-title has-normal-font-size"><a href="https://developer.wordpress.org/reference/hooks/export_wp_filename/"><span class="hook-func">apply_filters</span>( ‘export_wp_filename’, <nobr><span class="arg-type">string</span> <span class="arg-name">$wp_filename</span></nobr>, <nobr><span class="arg-type">string</span> <span class="arg-name">$sitename</span></nobr>, <nobr><span class="arg-type">string</span> <span class="arg-name">$date</span></nobr> )</a></dt><dd><p>Filters the export filename.</p>
</dd><dt class="wp-block-wporg-code-reference-title has-normal-font-size"><a href="https://developer.wordpress.org/reference/hooks/rss2_head/"><span class="hook-func">do_action</span>( ‘rss2_head’ )</a></dt><dd><p>Fires at the end of the RSS2 Feed Header.</p>
</dd><dt class="wp-block-wporg-code-reference-title has-normal-font-size"><a href="https://developer.wordpress.org/reference/hooks/the_content_export/"><span class="hook-func">apply_filters</span>( ‘the_content_export’, <nobr><span class="arg-type">string</span> <span class="arg-name">$post_content</span></nobr> )</a></dt><dd><p>Filters the post content used for WXR exports.</p>
</dd><dt class="wp-block-wporg-code-reference-title has-normal-font-size"><a href="https://developer.wordpress.org/reference/hooks/the_excerpt_export/"><span class="hook-func">apply_filters</span>( ‘the_excerpt_export’, <nobr><span class="arg-type">string</span> <span class="arg-name">$post_excerpt</span></nobr> )</a></dt><dd><p>Filters the post excerpt used for WXR exports.</p>
</dd><dt class="wp-block-wporg-code-reference-title has-normal-font-size"><a href="https://developer.wordpress.org/reference/hooks/the_title_export/"><span class="hook-func">apply_filters</span>( ‘the_title_export’, <nobr><span class="arg-type">string</span> <span class="arg-name">$post_title</span></nobr> )</a></dt><dd><p>Filters the post title used for WXR exports.</p>
</dd><dt class="wp-block-wporg-code-reference-title has-normal-font-size"><a href="https://developer.wordpress.org/reference/hooks/wxr_export_skip_commentmeta/"><span class="hook-func">apply_filters</span>( ‘wxr_export_skip_commentmeta’, <nobr><span class="arg-type">bool</span> <span class="arg-name">$skip</span></nobr>, <nobr><span class="arg-type">string</span> <span class="arg-name">$meta_key</span></nobr>, <nobr><span class="arg-type">object</span> <span class="arg-name">$meta</span></nobr> )</a></dt><dd><p>Filters whether to selectively skip comment meta used for WXR exports.</p>
</dd><dt class="wp-block-wporg-code-reference-title has-normal-font-size"><a href="https://developer.wordpress.org/reference/hooks/wxr_export_skip_postmeta/"><span class="hook-func">apply_filters</span>( ‘wxr_export_skip_postmeta’, <nobr><span class="arg-type">bool</span> <span class="arg-name">$skip</span></nobr>, <nobr><span class="arg-type">string</span> <span class="arg-name">$meta_key</span></nobr>, <nobr><span class="arg-type">object</span> <span class="arg-name">$meta</span></nobr> )</a></dt><dd><p>Filters whether to selectively skip post meta used for WXR exports.</p>
</dd></dl></section>
<section class="wp-block-wporg-code-reference-related" data-nosnippet="true"><h2 id="related" class="is-toc-heading wp-block-heading has-heading-5-font-size" tabindex="-1" ><a href="#related">Related</a></h2> <section style="margin-top:var(--wp--preset--spacing--20)" class="wp-block-wporg-code-table" id="uses"><figure class="wp-block-table "><table><thead><tr><th scope="col">Uses</th><th scope="col">Description</th></tr></thead><tbody><tr class=""><td><a href="https://developer.wordpress.org/reference/functions/wxr_term_meta/">wxr_term_meta()</a><code>wp-admin/includes/export.php
Outputs term meta XML tags for a given term object.
wxr_post_taxonomy()wp-admin/includes/export.php
Outputs list of taxonomy terms, in XML tag format, associated with a post.
wxr_site_url()wp-admin/includes/export.php
Returns the URL of the site.
wxr_authors_list()wp-admin/includes/export.php
Outputs list of authors with posts.
wxr_cdata()wp-admin/includes/export.php
Wraps given string in XML CDATA tag.
wxr_cat_name()wp-admin/includes/export.php
Outputs a cat_name XML tag from a given category object.
wxr_category_description()wp-admin/includes/export.php
Outputs a category_description XML tag from a given category object.
wxr_tag_name()wp-admin/includes/export.php
Outputs a tag_name XML tag from a given tag object.
wxr_tag_description()wp-admin/includes/export.php
Outputs a tag_description XML tag from a given tag object.
wxr_term_name()wp-admin/includes/export.php
Outputs a term_name XML tag from a given term object.
wxr_term_description()wp-admin/includes/export.php
Outputs a term_description XML tag from a given term object.
wxr_nav_menu_terms()wp-admin/includes/export.php
Outputs all navigation menu terms.
the_generator()wp-includes/general-template.php
Displays the generator XML or Comment for RSS, ATOM, etc.
get_post_time()wp-includes/general-template.php
Retrieves the localized time of the post.
setup_postdata()wp-includes/query.php
Set up global post data.
get_tags()wp-includes/category.php
Retrieves all post tags.
get_categories()wp-includes/category.php
Retrieves a list of category objects.
mysql2date()wp-includes/functions.php
Converts given MySQL date string into a different format.
term_exists()wp-includes/taxonomy.php
Determines whether a taxonomy term exists.
get_terms()wp-includes/taxonomy.php
Retrieves the terms in a given taxonomy or list of taxonomies.
get_taxonomies()wp-includes/taxonomy.php
Retrieves a list of registered taxonomy names or objects.
the_permalink_rss()wp-includes/feed.php
Displays the permalink to the post for use in feeds.
bloginfo_rss()wp-includes/feed.php
Displays RSS container for the bloginfo function.
the_guid()wp-includes/post-template.php
Displays the Post Global Unique Identifier (guid).
wp_get_attachment_url()wp-includes/post.php
Retrieves the URL for an attachment.
is_sticky()wp-includes/post.php
Determines whether a post is sticky.
post_type_exists()wp-includes/post.php
Determines whether a post type is registered.
get_the_author_meta()wp-includes/author-template.php
Retrieves the requested data of the author of the current post.
wpdb::get_col()wp-includes/class-wpdb.php
Retrieves one column from the database.
sanitize_key()wp-includes/formatting.php
Sanitizes a string key.
get_bloginfo()wp-includes/general-template.php
Retrieves information about the current site.
sanitize_url()wp-includes/formatting.php
Sanitizes a URL for database or redirect usage.
wp_parse_args()wp-includes/functions.php
Merges user defined arguments into defaults array.
get_term()wp-includes/taxonomy.php
Gets all term data from database by term ID.
do_action()wp-includes/plugin.php
Calls the callback functions that have been added to an action hook.
apply_filters()wp-includes/plugin.php
Calls the callback functions that have been added to a filter hook.
add_filter()wp-includes/plugin.php
Adds a callback function to a filter hook.
get_option()wp-includes/option.php
Retrieves an option value based on an option name.
get_post_type_object()wp-includes/post.php
Retrieves a post type object by name.
get_post_types()wp-includes/post.php
Gets a list of all registered post type objects.
wpdb::get_results()wp-includes/class-wpdb.php
Retrieves an entire SQL result set from the database (i.e., many rows).
wpdb::prepare()wp-includes/class-wpdb.php
Prepares a SQL query for safe execution.