在对该功能进行了大量搜索之后，我找到了解决方案。

请检查以下示例。

global $wpdb;
    if (isset($_POST[\'submit1\'])) {
//$uri = get_template_directory_uri().\'/xmlupload/\';
        $uri = wp_upload_dir();
        $target_dir = $uri;
        $target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
        $filename = basename($_FILES["fileToUpload"]["name"]);
        $filetypenew = wp_check_filetype($filename);
        $uploadOk = 1;
        $FileType = pathinfo($target_file, PATHINFO_EXTENSION);
//$FileType = pathinfo($filetype,PATHINFO_EXTENSION);

// Check if file already exists
        if (file_exists($target_file)) {
            echo "<br/><br/>Sorry, file already exists.";
            $uploadOk = 0;
        }
// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000) {
            echo "<br/><br/>Sorry, your file is too large.";
            $uploadOk = 0;
        }
// Allow certain file formats
        if ($FileType != "xml") {
            echo "<br/><br/>Sorry, only XML files are allowed.";
            $uploadOk = 0;
        }
// Check if $uploadOk is set to 0 by an error
        if ($uploadOk == 0) {
            echo "<br/><br/>Sorry, your file was not uploaded.";
            //echo "<br/>".$uri;
            //echo "<br/>".$target_file;
            //echo "<br/>file name is ".$filetypenew." file name is ".$filename;
// if everything is ok, try to upload file
        } else {
            if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
                echo "<br/><br/>The file " . basename($_FILES["fileToUpload"]["name"]) . " has been uploaded successfully!!.";
                $xml = simplexml_load_file($target_file,null,LIBXML_NOCDATA);

            $counter = 0;
            $status = \'\';
            $state = \'\';
            $suburb = \'\';
            $additional_array = \'\';
            foreach ($xml->children() as $key => $property) {

                // Gather post data.
                $post = array(
                    \'post_title\'    => $property->headline,
                    \'post_content\'  => $property->description,
                    \'post_status\'   => \'publish\',
                    \'post_type\'   => \'property\',
                    \'post_author\'   => 1
                );

                // Insert the post into the database.
                $post_id = wp_insert_post( $post );

                // Gather agent post data.
                $agent_post = array(
                    \'post_title\'    => $property->listingAgent->name,
                    \'post_status\'   => \'publish\',
                    \'post_type\'   => \'houzez_agent\',
                    \'post_author\'   => 1
                );

                // Insert the post into the database.
                $agent_id = wp_insert_post( $agent_post );

                if(!term_exists( $key, \'property_type\')){
                    $cat_id = wp_insert_term( ucfirst($key), \'property_type\', array( \'slug\' => $key ) );
                    wp_set_post_terms( $post_id, array($cat_id[\'term_id\']), \'property_type\' );
                }else{
                    $term = get_term_by(\'slug\', $key, \'property_type\');
                    wp_set_post_terms( $post_id, array($term->term_id), \'property_type\' );
                }

                if(!term_exists( strtolower($property->address->state), \'property_state\')) {
                    if ($state != strtolower($property->address->state)) {
                        $state_id = wp_insert_term($property->address->state, \'property_state\', array(\'slug\' => strtolower($property->address->state)));
                    }
                    wp_set_post_terms($post_id, array($state_id[\'term_id\']), \'property_state\');
                }else{
                    $term = get_term_by(\'slug\', strtolower($property->address->state), \'property_state\');
                    wp_set_post_terms($post_id, array($term->term_id), \'property_state\');
                }

                if($key == \'residential\' || $key == \'rental\'){
                    if(!term_exists( $property->authority->attributes()[\'value\'], \'property_status\')) {
                        if ($status != $property->authority->attributes()[\'value\']) {
                            $status_id = wp_insert_term(ucfirst($property->authority->attributes()[\'value\']), \'property_status\', array(\'slug\' => $property->authority->attributes()[\'value\']));
                        }
                        wp_set_post_terms($post_id, array($status_id[\'term_id\']), \'property_status\');
                    }else{
                        $term = get_term_by(\'slug\', $property->authority->attributes()[\'value\'], \'property_status\');
                        wp_set_post_terms($post_id, array($term->term_id), \'property_status\');
                    }
                }else{
                    if(!term_exists( $property->commercialAuthority->attributes()[\'value\'], \'property_status\')) {
                        if ($status != $property->commercialAuthority->attributes()[\'value\']) {
                            $status_id = wp_insert_term(ucfirst($property->commercialAuthority->attributes()[\'value\']), \'property_status\', array(\'slug\' => $property->commercialAuthority->attributes()[\'value\']));
                        }
                        wp_set_post_terms($post_id, array($status_id[\'term_id\']), \'property_status\');
                    }else{
                        $term = get_term_by(\'slug\', $property->commercialAuthority->attributes()[\'value\'], \'property_status\');
                        wp_set_post_terms($post_id, array($term->term_id), \'property_status\');
                    }
                }



                $table_name = $wpdb->prefix . \'postmeta\';

                $data1 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_property_bedrooms\',
                    \'meta_value\' => $property->features->bedrooms
                );

                $wpdb->insert($table_name, $data1, \'%s\');

                $data2 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_property_bathrooms\',
                    \'meta_value\' => $property->features->bathrooms
                );

                $wpdb->insert($table_name, $data2, \'%s\');

                $data3 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_property_garage\',
                    \'meta_value\' => $property->features->garages
                );

                $wpdb->insert($table_name, $data3, \'%s\');

                $data4 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_property_id\',
                    \'meta_value\' => $property->uniqueID
                );

                $wpdb->insert($table_name, $data4, \'%s\');

                $data5 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_property_price\',
                    \'meta_value\' => $property->price
                );

                $wpdb->insert($table_name, $data5, \'%s\');

                $data6 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_property_price_postfix\',
                    \'meta_value\' => \'mo\'
                );

                $wpdb->insert($table_name, $data6, \'%s\');

                $data7 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_property_map_address\',
                    \'meta_value\' => $property->address->streetNumber.\',\'.$property->address->street.\',\'.$property->address->suburb.\',\'.$property->address->state.\',\'.$property->address->postcode
                );

                $wpdb->insert($table_name, $data7, \'%s\');

                $data8 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_property_location\',
                    \'meta_value\' => $property->Geocode->Longitude.\',\'.$property->Geocode->Latitude
                );

                $wpdb->insert($table_name, $data8, \'%s\');

                $data9 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_property_country\',
                    \'meta_value\' => $property->address->state
                );

                $wpdb->insert($table_name, $data9, \'%s\');

                $data10 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_property_address\',
                    \'meta_value\' => $property->address->street
                );

                $wpdb->insert($table_name, $data10, \'%s\');

                $data11 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_property_zip\',
                    \'meta_value\' => $property->address->postcode
                );

                $wpdb->insert($table_name, $data11, \'%s\');

                $media_id = media_sideload_image( $property->images->img[0]->attributes()[\'url\'], $post_id, \'\', $return = \'id\' );

                $data12 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'_thumbnail_id\',
                    \'meta_value\' => $media_id
                );

                $wpdb->insert($table_name, $data12, \'%s\');

                foreach ($property->images->img as $images){
                    if($images->attributes()[\'url\'] != \'\'){
                        $medias_id = media_sideload_image( $images->attributes()[\'url\'], $post_id, \'\', $return = \'id\' );
                        $data13 = array(
                            \'post_id\' => $post_id,
                            \'meta_key\' => \'fave_property_images\',
                            \'meta_value\' => $medias_id
                        );

                        $wpdb->insert($table_name, $data13, \'%s\');
                    }
                }

                $data14 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_property_zip\',
                    \'meta_value\' => $property->address->postcode
                );

                $wpdb->insert($table_name, $data14, \'%s\');

                $data15 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'slide_template\',
                    \'meta_value\' => \'default\'
                );

                $wpdb->insert($table_name, $data15, \'%s\');

                $data16 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_property_map_street_view\',
                    \'meta_value\' => \'show\'
                );

                $wpdb->insert($table_name, $data16, \'%s\');

                $data17 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'houzez_geolocation_long\',
                    \'meta_value\' => $property->Geocode->Longitude
                );

                $wpdb->insert($table_name, $data17, \'%s\');

                $data18 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'houzez_geolocation_lat\',
                    \'meta_value\' => $property->Geocode->Latitude
                );

                $wpdb->insert($table_name, $data18, \'%s\');

                $data19 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'property_status\',
                    \'meta_value\' => $property->attributes()[\'status\']
                );

                $wpdb->insert($table_name, $data19, \'%s\');

                $data20 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'property_authority\',
                    \'meta_value\' => $property->authority->attributes()[\'value\']
                );

                $wpdb->insert($table_name, $data20, \'%s\');

                $data21 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'property_category\',
                    \'meta_value\' => $property->category->attributes()[\'name\']
                );

                $wpdb->insert($table_name, $data21, \'%s\');

                $data22 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'property_unique_id\',
                    \'meta_value\' => $property->uniqueID
                );

                $wpdb->insert($table_name, $data22, \'%s\');

                $data23 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_property_map\',
                    \'meta_value\' => \'1\'
                );

                $wpdb->insert($table_name, $data23, \'%s\');

                $additional_array[] = array(
                    \'fave_additional_feature_title\' => \'Feature\',
                    \'fave_additional_feature_value\' => \'"\'.$property->features->otherFeatures.\'"\'
                );
                $data24 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'additional_features\',
                    \'meta_value\' => serialize($additional_array)
                );

                $wpdb->insert($table_name, $data24, \'%s\');

                $data25 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_additional_features_enable\',
                    \'meta_value\' => \'enable\'
                );

                $wpdb->insert($table_name, $data25, \'%s\');

                $data26 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'property_video_url\',
                    \'meta_value\' => $property->videoLink
                );

                $wpdb->insert($table_name, $data26, \'%s\');

                $data27 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_video_url\',
                    \'meta_value\' => $property->videoLink
                );

                $wpdb->insert($table_name, $data27, \'%s\');

                $data28 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'property_floorplan\',
                    \'meta_value\' => $property->objects->floorplan->attributes()[\'url\']
                );

                $wpdb->insert($table_name, $data28, \'%s\');

                $data29 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_featured\',
                    \'meta_value\' => \'1\'
                );

                $wpdb->insert($table_name, $data29, \'%s\');

                $data30 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_agents\',
                    \'meta_value\' => $agent_id
                );

                $wpdb->insert($table_name, $data30, \'%s\');

                $data31 = array(
                    \'post_id\' => $post_id,
                    \'meta_key\' => \'fave_agent_display_option\',
                    \'meta_value\' => \'agent_info\'
                );

                $wpdb->insert($table_name, $data31, \'%s\');

                // Agent meta

                if($property->listingAgent->telephone->attributes()[\'type\'] == \'mobile\'){
                    $agentdata1 = array(
                        \'post_id\' => $agent_id,
                        \'meta_key\' => \'fave_agent_mobile\',
                        \'meta_value\' => $property->listingAgent->telephone
                    );

                    $wpdb->insert($table_name, $agentdata1, \'%s\');
                }

                if($property->listingAgent->telephone->attributes()[\'type\'] == \'BH\'){
                    $agentdata2 = array(
                        \'post_id\' => $agent_id,
                        \'meta_key\' => \'fave_agent_office_num\',
                        \'meta_value\' => $property->listingAgent->telephone
                    );

                    $wpdb->insert($table_name, $agentdata2, \'%s\');
                }

                $agentdata3 = array(
                    \'post_id\' => $agent_id,
                    \'meta_key\' => \'fave_agent_email\',
                    \'meta_value\' => $property->listingAgent->email
                );

                $wpdb->insert($table_name, $agentdata3, \'%s\');

                $agentdata4 = array(
                    \'post_id\' => $agent_id,
                    \'meta_key\' => \'fave_agent_agencies\',
                    \'meta_value\' => $property->listingAgent->office_id
                );

                $wpdb->insert($table_name, $agentdata4, \'%s\');

                $agentdata5 = array(
                    \'post_id\' => $agent_id,
                    \'meta_key\' => \'fave_agent_id\',
                    \'meta_value\' => $property->listingAgent->agentid
                );

                $wpdb->insert($table_name, $agentdata5, \'%s\');

                $agentdata6 = array(
                    \'post_id\' => $agent_id,
                    \'meta_key\' => \'slide_template\',
                    \'meta_value\' => \'default\'
                );

                $wpdb->insert($table_name, $agentdata6, \'%s\');

                /*update_post_meta($post_id,\'fave_property_bedrooms\',$property->features->bedrooms);
                update_post_meta($post_id,\'fave_property_bathrooms\',$property->features->bathrooms);
                update_post_meta($post_id,\'fave_property_garage\',$property->features->garages);
                update_post_meta($post_id,\'fave_property_id\',$property->uniqueID);
                update_post_meta($post_id,\'fave_property_price\',$property->price);
                update_post_meta($post_id,\'fave_property_price_postfix\',\'mo\');
                update_post_meta($post_id,\'fave_property_map_address\',$property->address->streetNumber.\',\'.$property->address->street.\',\'.$property->address->suburb.\',\'.$property->address->state.\',\'.$property->address->postcode);
                update_post_meta($post_id,\'fave_property_location\',$property->Geocode->Longitude.\',\'.$property->Geocode->Latitude);
                update_post_meta($post_id,\'fave_property_country\',$property->address->state);
                update_post_meta($post_id,\'fave_property_address\',$property->address->street);
                update_post_meta($post_id,\'fave_property_zip\',$property->address->postcode);
                //update_post_meta($post_id,\'fave_video_url\',$property->address->postcode);
                $media_id = media_sideload_image( $property->images->img[0]->attributes()[\'url\'], $post_id, \'\', $return = \'id\' );
                update_post_meta($post_id,\'_thumbnail_id\',$media_id);
                foreach ($property->images->img as $images){
                    $medias_id = media_sideload_image( $images->attributes()[\'url\'], $post_id, \'\', $return = \'id\' );
                    add_post_meta($post_id,\'fave_property_images\',$medias_id);
                }
                update_post_meta($post_id,\'fave_property_zip\',$property->address->postcode);
                update_post_meta($post_id,\'slide_template\',\'default\');
                update_post_meta($post_id,\'fave_property_map_street_view\',\'show\');
                update_post_meta($post_id,\'houzez_geolocation_long\',$property->Geocode->Longitude);
                update_post_meta($post_id,\'houzez_geolocation_lat\',$property->Geocode->Latitude);
                update_post_meta($post_id,\'property_status\',$property->attributes()[\'status\']);
                update_post_meta($post_id,\'property_authority\',$property->authority->attributes()[\'value\']);
                update_post_meta($post_id,\'property_category\',$property->category->attributes()[\'name\']);
                update_post_meta($post_id,\'property_unique_id\',$property->uniqueID);*/
                if($key == \'residential\' || $key == \'rental\'){
                    $status = $property->authority->attributes()[\'value\'];
                }else{
                    $status = $property->commercialAuthority->attributes()[\'value\'];
                }
                $state = strtolower($property->address->state);

            }
            // deleting the file
            //unlink($target_file);
            /* end storing in db */
            //redirecting
            //wp_redirect(admin_url(\'admin.php?page=custom-importer\', \'http\'), 301);
            //end redirecting
        } else {
            echo "<br/><br/>Sorry, there was an error uploading your file.";
        }
    }
}