title: Code not working after upgrade to PHP7
body: <p>I have problem with my PHP code after upgrade PHP to version 7.</p>
  
  <pre><code>                &lt;?php
                  include ("dbconfig.php");
                      $conn-&gt;select_db("zapis");
                  echo "&lt;div class="form-group"&gt;";
                  echo "&lt;select class="form-control" id="sel1"&gt;";
                                  $zapytanie = $conn-&gt;query("SELECT id, oferta FROM ofertameska");
                                  while($row = $zapytanie-&gt;fetch_assoc()){
                                       echo "&lt;option value=".{$row['id']}."&gt;".{$row['oferta']}."&lt;/option&gt;";
                                  }
                  echo "&lt;/select&gt;";
          echo "&lt;/div&gt;";
                  $zapytanie-&gt;free();
                  $conn-&gt;close();
        ?&gt;
  </code></pre>
  
  <p>What's wrong?</p>
  
  <p>Error message is:</p>
  
  <blockquote>
    <p>Error: Fatal error: Uncaught Error: Class 'mysqli' not found in /var/www/html/hest/meski/dbconfig.php:5</p>
  </blockquote>