$post = array(
          'comment_status' => 'closed',
          'ping_status'    => 'closed',
          'post_category'  => array(4),
          'post_content'   => $_POST['text'],
          'post_name'      => 'Post_Name',
          'post_status'    => 'publish',
          'post_title'     => $_POST['title'],
          'post_type'      => 'post'
        );

        $post_id = wp_insert_post( $post, $wp_error);

        $post = array(
          'comment_status' => 'closed',
          'ping_status'    => 'closed',
          'post_category'  => array(4),
          'post_content'   => $_POST['text'] . 'content6',
          'post_name'      => 'Post_Name',
          'post_status'    => 'publish',
          'post_title'     => $_POST['title'] . 'title6',
          'post_type'      => 'post'
        );


        $post_id = wp_insert_post( $post, $wp_error);

        $filename = 'upload2.jpg';
        $wp_filetype = wp_check_filetype(basename($filename), null );
        $wp_upload_dir = wp_upload_dir();
        $attachment = array(
            'guid' => $wp_upload_dir['url'] . '/' . basename( $filename ),
            'post_mime_type' => $wp_filetype['type'],
            'post_title' => $_POST['title'] . 'title_image',
            'post_content' => '',
            'post_status' => 'inherit'
        );

        $attach_id = wp_insert_attachment( $attachment, $wp_upload_dir['url'] . '/' . $filename, $post_id);
        add_post_meta($post_id, '_thumbnail_id', $attach_id);