title: How remove or change <title> tag in wordpress using plugin , add_filter ?
body: <p>I need change or remove <code>&lt;title&gt;</code> tag in wordpress using plugin<br>
  for example <code>&lt;title&gt; My old title &lt;/title&gt;</code> => <code>&lt;title&gt; New title &lt;/title&gt;</code></p>
  
  <p>I try it </p>
  
  <pre><code>function plugin_title($content){
      $content=str_replace('My old title','New title',$content); 
      return $content;
  }
  
  add_filter('wp_head','plugin_title');
  </code></pre>
  
  <p>//  but it doesn't work .   Any idea ? </p>