title: Proper use of PHP: header('Content-language: ...');
body: <p>aside the obvious fashion of setting the language of a page:</p>
  
  <pre><code>&lt;meta name="language" content="de"&gt;&lt;html lang="de"&gt;
  </code></pre>
  
  <p>I recently found an amazing aspect typical to only the programming language of PHP that could enables developers to set the language at the very top of PHP files:</p>
  
  <pre><code>&lt;?php  
  
   /* Set and pre-define the language in the header;
    * Eliminating guesswork for the Header language.
    */
  
    header('Content-language: de');
  
  ?&gt;
  </code></pre>
  
  <p>Two questions arise eveidentaly to the PHP programmer:</p>
  
  <p><strong>Main Question: When should one set the language in a PHP header?</strong>  </p>
  
  <p>SideQ1: Big websites don't bother using it: why don't they?</p>
  
  <p>SideQ2: Do search engines listen to this and if so, what implications does this PHP header have?</p>