php错误获取非对象的属性

Question

我有一个错误，就是试图获取非对象的属性。请帮助我做错了

错误消息：注意：尝试获取非对象的属性，这是代码的检查结果部分。

     <?php

    class search {

      private $mysqli;


  public function __construct() {
    $this->connect();
  }
  private function connect() {
    $this->mysqli = new mysqli( 'localhost', 'root', '', 'csvfiles' );
  }

  public function search($search_term) {
    $sanitized = $this->mysqli->real_escape_string($search_term);

    // Run the query
    $query = $this->mysqli->query("
  SELECT title, `COL 1`, `COL 2`
  FROM `search`
  WHERE `title` LIKE '%{$sanitized}%'
  OR `body` LIKE '%{$sanitized}%'
");

    // Check results
    if ( ! $query->num_rows ) {

      return false;
    }

    // Loop and fetch objects
    while( $row = $query->fetch_object() ) {
      $rows[] = $row;
    }

    // Build our return result
    $search_results = array(
      'count' => $query->num_rows,
      'results' => $rows,
    );

    return $search_results;
  }
}