php搜索不起作用

有一个带有搜索表单的代码，它应该通过几个输入的单词来搜索一篇文章。它通过一个单词找到所有内容，但如果我写第二个单词，则会出现错误：警告：mysqli_fetch_assoc() 期望参数 1 为 mysqli_result，布尔值在 D:\OpenServer\OpenServer\domains\localhost\src\news_auth.php 中给出第 105 行 第 105 行是"while($article = mysqli_fetch_assoc($query)){?>"行。我试图修复它，我认为问题出在引号中，我无法正确放置，但显然不是。请帮我解决这个问题。代码本身：

<form action="" method="post">
    <div class="news_searching"><input type="text" name="search" class="news_search" placeholder="Введите статью">
    <input type="submit" name="submit" class="news_search_button">
    </div>
    </form>
    <hr>
 <?php

 if(isset($_POST['submit'])){
  $search = explode(" ", $_POST['search']);
  $count = count($search);
  $array = array();
  $i = 0;
  foreach($search as $key) {
    $i++;
    if($i < $count) $array[] = "CONCAT (`title`) LIKE '%".$key."%' OR"; else $array[] = "CONCAT (`title`) LIKE '%".$key."%'";
  }
  $sql = "SELECT * FROM `news` WHERE ".implode("", $array);
  $query = mysqli_query($connection, $sql);
      while($article = mysqli_fetch_assoc($query)){?>
        <div class="news_wrapper">
        <img src="<?=$article['picture']?>" alt="" class='news_img'/>
        <div class="news_text">
            <div class="news_title">
              <a href="content_article.php?id_n=<?=$article['id_n']?>"><?=$article['title']?></a>
            </div>
              <div class="news_descr">
                <?=$article['descr']?>
              </div> 
                <div class="news_info">
                  <div class="news_login">
                    <?=$article['login']?>
                  </div>
                  <div class="news_likes">
                  <img src="icons/eye.png" alt="" class="article_eye">
                    <a src="#" alt="" class="button-like">
                    <img src="icons/heart.png" alt="">
                    </a>
                  <?=$article['likes']?>
                  </div>
                </div>
            </div>
        </div>
      <?php
      }
      }?>