php outputs sourcecode instead of running nginx -

i have showing on site. lang function showing on web, not runned should run on site. server running nginx

q: why doing that, , how can prevented?

content of file:

    <?  function lang($line) {      $ci = & get_instance();     $languagevariable = explode(" ", $line);     $outcome = '';         foreach($languagevariable $langline) {         $outcome .= $ci->lang->line($langline);          }         return $outcome;   }  function langw($string, $var1 = false, $var2 = false, $var3 = false) {     return sprintf(lang($string), ($var1 ? $var1 : ''), ($var2 ? $var2 : '')); }    function langv($line, $var) {     $ci = & get_instance();     return sprintf($ci->lang->line($line), $var); } 

make sure have:

short_open_tag=on 

in php.ini, restart nginx server

http://php.net/manual/en/ini.core.php#ini.short-open-tag

if can't edit php.ini, can either replace <? <?php (not best..) or add following .htaccess file in document root:

php_value short_open_tag 1 

remember hosting have disabled option, it's not 100% guaranteed .htaccess way works.