Живой поиск с использованием PHP MySQL и JavaScript

<?php
/************************************************
    The Search PHP File
************************************************/
 
 
/************************************************
    MySQL Connect
************************************************/
 
// Credentials
$dbhost = "localhost";
$dbname = "informatordb";
$dbuser = "Support";
$dbpass = "support";
 
//  Connection
global $tutorial_db;
 
$tutorial_db = new mysqli();
$tutorial_db->connect($dbhost, $dbuser, $dbpass, $dbname);
$tutorial_db->set_charset("utf8");
 
//  Check Connection
if ($tutorial_db->connect_errno) {
    printf("Connect failed: %s\n", $tutorial_db->connect_error);
    exit();
}
 
/************************************************
    Search Functionality
************************************************/
 
// Define Output HTML Formating
$html = '';
$html .= '<li class="result">';
$html .= '<a target="_blank" href="urlString">';
$html .= '<h3>nameString</h3>';
$html .= '<h4>functionString</h4>';
$html .= '</a>';
$html .= '</li>';
 
// Get Search
$search_string = preg_replace("/[^A-Za-zа-яА-Я0-9]/", " ", $_POST['query']);
$search_string = $tutorial_db->real_escape_string($search_string);
 
// Check Length More Than One Character
if (strlen($search_string) >= 1 && $search_string !== ' ') {
    // Build Query
    $query = 'SELECT * FROM tarifs WHERE name LIKE "%'.$search_string.'%" OR name LIKE "%'.$search_string.'%"';
 
    // Do Search
    $result = $tutorial_db->query($query);
    while($results = $result->fetch_array()) {
        $result_array[] = $results;
    }
 
    // Check If We Have Results
    if (isset($result_array)) {
        foreach ($result_array as $result) {
 
            // Format Output Strings And Hightlight Matches
            $display_function = preg_replace("/".$search_string."/i", "<b class='highlight'>".$search_string."</b>", $result['name']);
            $display_name = preg_replace("/".$search_string."/i", "<b class='highlight'>".$search_string."</b>", $result['name']);
            $display_url = 'http://php.net/manual-lookup.php?pattern='.urlencode($result['name']).'&lang=en';
 
            // Insert Name
            $output = str_replace('nameString', $display_name, $html);
 
            // Insert Function
            $output = str_replace('functionString', $display_function, $output);
 
            // Insert URL
            $output = str_replace('urlString', $display_url, $output);
 
            // Output
            echo($output);
        }
    }else{
 
        // Format No Results Output
        $output = str_replace('urlString', 'javascript:void(0);', $html);
        $output = str_replace('nameString', '<b>No Results Found.</b>', $output);
        $output = str_replace('functionString', 'Sorry :(', $output);
 
        // Output
        echo($output);
    }
}