phpMyAdmin error call to undefined function
<p>when I go to localhost/phpmyadmin I have a white page and there is an error in the apache2 log's:</p>

<blockquote>
  <p>PHP Fatal error:  Uncaught Error: Call to undefined function __() in /usr/share/phpmyadmin/libraries/core.lib.php:245\nStack trace:\n#0 /usr/share/phpmyadmin/libraries/core.lib.php(321): PMA_fatalError('The [a@./url.ph...')\n#1 /usr/share/phpmyadmin/libraries/common.inc.php(298): PMA_warnMissingExtension('json', true)\n#2 /usr/share/phpmyadmin/index.php(12): require_once('/usr/share/phpm...')\n#3 {main}\n  thrown in /usr/share/phpmyadmin/libraries/core.lib.php on line 245</p>
</blockquote>

<p>I search on the web and I see there is a problem with the php-mbstring, so I installed it but not fix the problem. I have also reinstall completely php, mysql and phpmyadmin...</p>