title: Wordpress oop wpdb in class
body: <p>I am new in OOP PHP and I am trying to use $wpdb (WORDPRESS) object in some of my custom classes but have no idea how to do it. Every time I try to implement basic operations with $wpdb results in fail.
  I need some basic stuff like get_results(),....
  So how to do something like this:</p>
  
  <pre><code>global $wpdb;
  
  $my_custom_table = $wpdb-&gt;prefix . "table_name";
  
  $table_content = $wpdb-&gt;get_results("SELECT * FROM ".$my_custom_table);
  </code></pre>
  
  <p>and put it into my class like this:</p>
  
  <pre><code>Class MyClass{
  
       public function table_results(){
              //put in here
              return $this-&gt;table_content;
       }
  }
  </code></pre>
  
  <p>I need that class in separate file so I could easily call to it.</p>