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<b>Warning</b>:  Undefined variable $mysqli in <b>/var/www/html/city.php</b> on line <b>49</b><br />
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<b>Fatal error</b>:  Uncaught Error: Call to a member function prepare() on null in /var/www/html/city.php:49
Stack trace:
#0 /var/www/html/index.php(24): include()
#1 {main}
  thrown in <b>/var/www/html/city.php</b> on line <b>49</b><br />