title: Validator: The value must be equal to the desired value
body: <p>How can I check if the value passed is equals to my desired value in the validation phase.</p>
  
  <pre><code>$rules = [
              'email' =&gt; 'required|email|max:255|unique:users',
              'password' =&gt; 'required|min:6',
              'admin_code' =&gt; 'required|&lt;the value must be equals to this code "admin"&gt;',
          ];
  </code></pre>