http://concrete5-japan.org/community/forums/development/post-8194/

controller.php

<?php
defined('C5_EXECUTE') or die("Access Denied.");

class SearchBlockController extends Concrete5_Controller_Block_Search {

	protected $hColor = array('#EFE795','#D1E095','#95F0C8','#95DAF0','#9E95F0');

	public function highlightedMarkup($fulltext, $highlight) {
	    if(!$highlight){
	       return $fulltext;
	    }
	    $highlight = str_replace("　"," ",$highlight);
	    if(strpos($highlight," ") !== false){
	       $highlights = explode(" ",$highlight);
	    }else{
	       $highlights = array($highlight);
	    }
		$this->hText = $fulltext;
		foreach($highlights as $hkey=>$highlight){
    		$this->hHighlight  = str_replace(array('"',"'","&quot;"),'',$highlight); // strip the quotes as they mess the regex
    		$this->hText = @preg_replace( "#$this->hHighlight#i", '<span style="background-color:'. $this->hColor[$hkey] .';">$0</span>', $this->hText );
		}
		return $this->hText; 
	}
	
	public function highlightedExtendedMarkup($fulltext, $highlight) {
		$text = @preg_replace("#\n|\r#", ' ', $fulltext);
		
		$matches = array();
	    if(strpos($highlight," ") !== false){
	       $highlights = explode(" ",$highlight);
	    }else{
	       $highlights = array($highlight);
	    }
	    foreach($highlights as $key=>$highlight){
	       $fulltext = str_replace($highlight,'<span style="background-color:'. $this->hColor[0] .';">'.$highlight."</span>",$fulltext);
	    }
	    $fulltext = explode('<span style="background-color:'. $this->hColor[0] .';">',$fulltext);
	    foreach($fulltext as $key=>$text){
	       if($key == 0){
	           $result = mb_substr($text,strlen($text)-40,40,"UTF-8");
	           continue;
	       }
	       $texts = explode("</span>",$text);
	       if(strlen($texts[1]) > 47){
	           $result .= '<span style="background-color:'. $this->hColor[$key] .';">'.$texts[0].'</span>'.mb_substr($texts[1], 0 , 47 , "UTF-8")."…";
	       }else{
	           $result .= '<span style="background-color:'. $this->hColor[$key] .';">'.$text;
	       }
	    }
        return $result;
	}

	public function setHighlightColor($color) {
		$this->hColor = array($color);
	}

	function do_search() {
		$q = $_REQUEST['query'];
		// i have NO idea why we added this in rev 2000. I think I was being stupid. - andrew
		// $_q = trim(preg_replace('/[^A-Za-z0-9\s\']/i', ' ', $_REQUEST['query']));
		$_q = $q;
		Loader::library('database_indexed_search');
		$ipl = new IndexedPageList();
		
		$ipl->setItemsPerPage(10); // 検索結果に表示するページ数を10件に設定
		
		$aksearch = false;
		$ipl->ignoreAliases();
		if (is_array($_REQUEST['akID'])) {
			Loader::model('attribute/categories/collection');
			foreach($_REQUEST['akID'] as $akID => $req) {
				$fak = CollectionAttributeKey::getByID($akID);
				if (is_object($fak)) {
					$type = $fak->getAttributeType();
					$cnt = $type->getController();
					$cnt->setAttributeKey($fak);
					$cnt->searchForm($ipl);
					$aksearch = true;
				}
			}
		}

		if (isset($_REQUEST['month']) && isset($_REQUEST['year'])) {
			$month = strtotime($_REQUEST['year'] . '-' . $_REQUEST['month'] . '-01');
			$month = date('Y-m-', $month);
			$ipl->filterByPublicDate($month . '%', 'like');
			$aksearch = true;
		}


		if (empty($_REQUEST['query']) && $aksearch == false) {
			return false;
		}

		$ipl->setSimpleIndexMode(true);
		if (isset($_REQUEST['query'])) {
			$ipl->filterByKeywords($_q);
		}

		if( is_array($_REQUEST['search_paths']) ){
			foreach($_REQUEST['search_paths'] as $path) {
				if(!strlen($path)) continue;
				$ipl->filterByPath($path);
			}
		} else if ($this->baseSearchPath != '') {
			$ipl->filterByPath($this->baseSearchPath);
		}

		$ipl->filter(false, '(ak_exclude_search_index = 0 or ak_exclude_search_index is null)');

		$res = $ipl->getPage();

		foreach($res as $r) {
			$results[] = new IndexedSearchResult($r['cID'], $r['cName'], $r['cDescription'], $r['score'], $r['cPath'], $r['content'], $r['cDatePublic']);
		}

		$this->set('query', $q);
		$this->set('paginator', $ipl->getPagination());
		$this->set('results', $results);
		$this->set('do_search', true);
		$this->set('searchList', $ipl);
	}
}