Wordpress : Custom search page and search by title, content and tag

gistfile1.php

<?php
include('../../../../wp-config.php');
$keyword = $_GET['k'];


  search($wpdb->get_results("SELECT * from wp_posts WHERE post_title LIKE '$keyword%'"), "Full keyword");

$keywords_split 		= explode(" ",$keyword);
for($i=0;$i<count($keywords_split);$i++){
	search($wpdb->get_results("SELECT * from wp_posts WHERE post_title LIKE '$keywords_split[$i]%'") ,"Split keyword = '$keywords_split[$i]'");
	search($wpdb->get_results("SELECT * from wp_posts WHERE post_content LIKE '%$keywords_split[$i]%'") ,"Split keyword = '$keywords_split[$i]' (Content)");
}



	$tags = str_replace(" ","-",$keyword).",".str_replace(" ",",",$keyword);
	$searchtags = new WP_Query(array('post_type'=>array('one','two','three') ,'tag' => $tags));
	
	while($searchtags->have_posts()):
		$searchtags->next_post();
		echo '<li>' . get_the_title($searchtags->post->ID ) . ' tag</li> ';
	endwhile;
	
	


function search($results,$mark){
				foreach($results as $data){
					if($data->post_status =='publish'){
						echo '<li>#'.$data->ID.' '.htmlentities($data->post_title).' ('.$mark.')</li>';
					}
				}
}

?>