title: Why is _POST sometimes empty when a textarea is posted in PHP
body: <p>PHP 4.4 and PHP 5.2.3 under Apache 2.2.4 on ubuntu.</p>
  
  <p>I am running Moodle 1.5.3 and have recently had a problem when updating a course. The $_POST variable is empty but only if a lot of text was entered into the textarea on the form. If only a short text is entered it works fine.</p>
  
  <p>I have increased the post_max_size from 8M to 200M and increased the memory_limit to 256M  but this has not helped.
  I have doubled the LimitRequestFieldSize and LimitRequestLine to 16380 and set LimitRequestBody to 0 with no improvement.</p>
  
  <p>I have googled for an answer but have been unable to find one.</p>
  
  <p>HTTP Headers on firefox shows the content size of 3816 with the correct data, so its just not getting to $_POST.</p>
  
  <p>The system was running fine until a few weeks ago. The only change was to /etc/hosts to correct a HELO issue with the exim4 email server.</p>
  
  <p>I can replicate the issue on a development machine that has exim4 not running so I think it is just coincidence.</p>
  
  <p>Thanks for your assistance.</p>