WordPress Plugin: MultiSite Global Search Pagination

<?php
if( !function_exists( 'ms_global_search_page' ) ) {
    function ms_global_search_page( $atts ) {

        global $wp_query, $wpdb;

        extract( shortcode_atts( array( 'excerpt' => 'no' ), $atts ) );

        $term = strip_tags( apply_filters( 'get_search_query', get_query_var( 'mssearch' ) ) );

        if( !empty( $term ) ) {
            // Literal keyword
            if( preg_match( '/^\"(.*?)\"$/', stripslashes($term) , $termmatch) ) {
                if( !empty( $termmatch[1] ) ) {
                    $termsearch = "( post_title LIKE '%%".$termmatch[1]."%%' OR post_content LIKE '%%".$termmatch[1]."%%' OR ".$wpdb->users.".display_name LIKE '%%".$termmatch[1]."%%' ) ";
                } else { ?>
                    <h3 class='globalpage_title center'><?php _e( "Not found", 'ms-global-search' ) ?></h3>
                    <p class='globalpage_message center'><?php _e( "Sorry, but you are looking for something that isn't here.", 'ms-global-search' ) ?></p>
                <?php
                }
            } else {
                // Multiple keywords
                $multipleterms = explode ( " ", $term );
                if( count($multipleterms) != 1 ) {
                    $termsearch = "( ";
                    $totalterms = count($multipleterms);
                    $numterms = 1;
                    foreach( $multipleterms as $aterm ) {
                        if( $numterms < $totalterms ) {
                            $termsearch .= " ( post_title LIKE '%%".$aterm."%%' OR post_content LIKE '%%".$aterm."%%' OR ".$wpdb->users.".display_name LIKE '%%".$aterm."%%' ) AND ";
                        } else {
                            $termsearch .= "( post_title LIKE '%%".$aterm."%%' OR post_content LIKE '%%".$aterm."%%' OR ".$wpdb->users.".display_name LIKE '%%".$aterm."%%' ) )";
                        }
                        $numterms++;
                    }
                } else {
                    $termsearch = "( post_title LIKE '%%".$term."%%' OR post_content LIKE '%%".$term."%%' OR ".$wpdb->users.".display_name LIKE '%%".$term."%%' ) ";
                }
            }

            $wheresearch = '';
            // Search only on user blogs.
            $userid = get_current_user_id();
            if( strcmp( apply_filters ( 'get_search_query', get_query_var( 'mswhere' ) ), 'my' ) == 0 && $userid != 0 ) {
                $userblogs = get_blogs_of_user( $userid );

                $i=0;
                foreach( $userblogs as $ub ) {
                    if( $i != 0 ) $wheresearch .= " OR ";
                    else $wheresearch .= "( ";
                    $i++;
                    $wheresearch .= $wpdb->base_prefix."v_posts.blog_id = ".$ub->userblog_id;
                    if( count( $userblogs ) == $i ) $wheresearch .= " ) AND ";
                }
            }

            // Search on pages.
            if(get_query_var( 'msp' )) {
                $post_type = "( post_type = 'post' OR post_type = 'page' )";
            } else {
                $post_type = "post_type = 'post'";
            }

            // Show private posts
            if ($userid != 0) {
                $request = $wpdb->prepare( "SELECT ".$wpdb->base_prefix."v_posts.* from ".$wpdb->base_prefix."v_posts left join ".$wpdb->users." on ".$wpdb->users.".ID=".$wpdb->base_prefix."v_posts.post_author ".
                "where ".$wheresearch." ".$termsearch.
                "AND ( post_status = 'publish' OR post_status = 'private' ) AND ".$post_type." ORDER BY ".$wpdb->base_prefix."v_posts.blog_id ASC, ".$wpdb->base_prefix."v_posts.post_date DESC, ".$wpdb->base_prefix."v_posts.comment_count DESC" );

            } else {
                $request = $wpdb->prepare( "SELECT ".$wpdb->base_prefix."v_posts.* from ".$wpdb->base_prefix."v_posts left join ".$wpdb->users." on ".$wpdb->users.".ID=".$wpdb->base_prefix."v_posts.post_author ".
                "where ".$wheresearch." ".$termsearch.
                "AND post_status = 'publish' AND ".$post_type." ORDER BY ".$wpdb->base_prefix."v_posts.blog_id ASC, ".$wpdb->base_prefix."v_posts.post_date DESC, ".$wpdb->base_prefix."v_posts.comment_count DESC" );
            }

            $search = $wpdb->get_results( $request );

            // Show search results.
            if( empty( $search ) ) { ?>
                <h3 class='globalpage_title center'><?php _e( "Not found", 'ms-global-search' ) ?> <span class='ms-global-search_term'><?php echo stripslashes($term); ?></span><?php if( !empty( $wheresearch ) ) echo " ".__( 'in your blogs', 'ms-global-search' ); ?>.</h3>
                <p class='globalpage_message center'><?php _e( "Sorry, but you are looking for something that isn't here.", 'ms-global-search' ) ?></p>
            <?php
            } else {
                $countResult = count( $search );
                if($countResult < 2){
                    echo '<p>'.$countResult." ".__( 'match with', 'ms-global-search' )." ";
                }else{
                    echo '<p>'.$countResult." ".__( 'matches with', 'ms-global-search' )." ";
                } ?>
                <span class='ms-global-search_term'><?php echo stripslashes($term); ?></span><?php if( !empty( $wheresearch ) ) echo " ".__( 'in your blogs', 'ms-global-search' ); ?>.</p>

             <?php

            $rows_per_page = 20;
            $current = (intval(get_query_var('paged'))) ? intval(get_query_var('paged')) : 1;

            $rows = $search;

            global $wp_rewrite;

            $pagination_args = array(
             'base' => @add_query_arg('paged','%#%'),
             'format' => '',
             'total' => ceil(sizeof($rows)/$rows_per_page),
             'current' => $current,
             'show_all' => false,
             'type' => 'plain',
            );

            if( $wp_rewrite->using_permalinks() )
             $pagination_args['base'] = $url = $_SERVER['REQUEST_URI'] . '&paged=%#%';

            if( !empty($wp_query->query_vars['s']) )
             $pagination_args['add_args'] = array('s'=>get_query_var('s'));



            $start = ($current - 1) * $rows_per_page;
            $end = $start + $rows_per_page;
            $end = (sizeof($rows) < $end) ? sizeof($rows) : $end;

            for ($i=$start;$i < $end ;++$i ) {
             $s = $rows[$i];
            $author = get_userdata( $s->post_author );
                    if( $blogid != $s->blog_id ) {
                        $blogid = $s->blog_id; ?>

                        <h2 class='globalblog_title'><?php echo get_blog_option( $blogid, 'blogname' ) ?></h2>
                    <?php
                    } ?>

                    <div <?php post_class( 'globalsearch_post' ) ?>>

                            <small class="date"><?php echo date( __( 'm/d/Y', 'ms-global-search' ) ,strtotime( $s->post_date ) ); ?></small>
                            <h2 id="post-<?php echo $s->ID.$s->blog_id; ?>" class="globalsearch_title"><a href="<?php echo get_blog_permalink( $s->blog_id, $s->ID ); ?>" rel="bookmark" title="<?php echo __( 'Permanent Link to', 'ms-global-search' ).' '.$s->post_title; ?>"><?php echo $s->post_title ?></a></h2>

                            <div class="entry">
                                <?php

                                    $sc = strip_tags($s->post_content);

                                     $words = explode(" ",$sc);

                                    $words = implode(" ",array_splice($words,0,50));

                                    echo $words;

                                ?>
                                <div class="clear"></div>
                                <a class="smallyellow" href="<?php echo get_blog_permalink( $s->blog_id, $s->ID ); ?>" rel="bookmark" title="<?php echo __( 'Permanent Link to', 'ms-global-search' ).' '.$s->post_title; ?>"><span>Read More</span></a>
                                <div class="clear"></div>
                            </div>

                    </div>
                <?php
                }

       echo '<div class="wp-pagenavi">'.paginate_links($pagination_args).'</div>';


            }
        } else { ?>
            <h3 class='globalpage_title center'><?php _e( "Not found", 'ms-global-search' ) ?></h3>
            <p class='globalpage_message center'><?php _e( "Sorry, but you are looking for something that isn't here.", 'ms-global-search' ) ?></p>
        <?php
        }
    }
}
?>