title: The PHP error log has stopped working. It did work
body: <p>It's been working for ages and stopped.  I must be missing something obvious.</p>
  <p>File <em>/etc/php5/apache2/php.ini</em> relevant settings are:</p>
  <pre class="lang-none prettyprint-override"><code>display_errors = On  (I am not sure if this makes a difference)
  log_errors = On
  error_log = &quot;/var/www/error_log.log&quot;
  </code></pre>
  <p>In my code I have:</p>
  <pre><code>echo 'About to log';
  error_log('An error');
  </code></pre>
  <p>I see &quot;About to log&quot; on the page, but nothing in the error log. How can I fix this?</p>