title: Trim unicode whitespace in PHP 5.2
body: <p>How can I trim a <code>string(6) " page"</code>, where the first whitespace is a 0xc2a0 non-breaking space?</p>
  
  <p>I've tried <code>trim()</code> and <code>preg_match('/^\s*(.*)\s*$/u', $key, $m);</code>.</p>
  
  <p>Another question: How can I reliably copy these characters? They seem to be converted to "normal" spaces, which makes it hard to debug.</p>