wp-includes/class-wp-xmlrpc-server.php:6682Retrieves post categories.
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array|IXR_ErrorOne hook fires while wp_xmlrpc_server::mt_getPostCategories() runs, in this order:
Fires after the XML-RPC user has been authenticated but before the rest of the method logic begins.
public function mt_getPostCategories( $args ) { $this->escape( $args ); $post_id = (int) $args[0]; $username = $args[1]; $password = $args[2]; $user = $this->login( $username, $password ); if ( ! $user ) { return $this->error; } if ( ! get_post( $post_id ) ) { return new IXR_Error( 404, __( 'Invalid post ID.' ) ); } if ( ! current_user_can( 'edit_post', $post_id ) ) { return new IXR_Error( 401, __( 'Sorry, you are not allowed to edit this post.' ) ); } /** This action is documented in wp-includes/class-wp-xmlrpc-server.php */ do_action( 'xmlrpc_call', 'mt.getPostCategories', $args, $this ); $categories = array(); $cat_ids = wp_get_post_categories( (int) $post_id ); // First listed category will be the primary category. $is_primary = true; foreach ( $cat_ids as $cat_id ) { $categories[] = array( 'categoryName' => get_cat_name( $cat_id ), 'categoryId' => (string) $cat_id, 'isPrimary' => $is_primary, ); $is_primary = false; } return $categories; }Introduced in 1.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-xmlrpc-server.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.