title: Apache is "Unable to initialize module" because of module's and PHP's API don't match after changing the PHP configuration
body: <p>php -v gives this</p>
  
  <pre><code>PHP Warning:  PHP Startup: memcache: Unable to initialize module
  Module compiled with module API=20060613
  PHP    compiled with module API=20090626
  These options need to match in Unknown on line 0
  PHP Warning:  PHP Startup: memcache: Unable to initialize module
  Module compiled with module API=20060613
  PHP    compiled with module API=20090626
  These options need to match in Unknown on line 0
  bogus test name tests/
  </code></pre>
  
  <p>ps. i've upgraded from php 5.2 to 5.3. before this everything worked okay.</p>