title: detect $_POST field name with same part
body: <p>Hey guys how i can detect $_POST fieldname name with same part in name like this:</p>
  
  <pre><code>fieldname = fg_1, fg_2, fg_3, ....;
  
  if($_POST['fg_*']){
      print 'ok';
  }else{
      print "fail";
  }
  </code></pre>
  
  <p>In my case <code>$_POST['fg_*']</code> did not work.</p>
  
  <p>Thank you</p>