title: Joomla giving blank screen after http error 500
body: <p>I had Joomla site giving an HTTP error <code>500</code> on both the frontend and backend. </p>
  
  <p>I changed the permissions on index.php to <code>755</code> but no luck. </p>
  
  <p>I noticed it was running PHP 5.6 so I upgraded to PHP 7 and now it's just giving me a blank screen. I checked the error log and I'm receiving the following error:</p>
  
  <pre><code>PHP Warning:  PHP Startup: Unable to load dynamic library 
  '/usr/php/54/usr/lib64/php/modules/uploadprogress.so' - 
  /usr/php/54/usr/lib64/php/modules/uploadprogress.so: undefined symbol: 
  zend_ini_string_ex in Unknown on line 0
  </code></pre>
  
  <p>I was also getting this error beforehand. Any ideas on what module I can / should disable to fix this?</p>