title: php class constant visibility
body: <p>Can we set visibility of class constant?<br>
  For this example:</p>
  
  <pre><code>class MyClass {
      const CONST_VALUE = 'A constant value';
  }
  </code></pre>
  
  <p>Can we specify</p>
  
  <pre><code>public const CONST_VALUE = 'A constant value';
  </code></pre>
  
  <p>or </p>
  
  <pre><code>private const CONST_VALUE = 'A constant value';
  </code></pre>
  
  <p>or </p>
  
  <pre><code>protected const CONST_VALUE = 'A constant value';
  </code></pre>