wordpress - Use of undefined constant REQUEST_URI - assumed 'REQUEST_URI' in functions.php on line 73

I recently moved my website into a new server , my database is perfectly configured but i keep getting this error and can't access my wp-admin :

Use of undefined constant REQUEST_URI - assumed 'REQUEST_URI' in

/www/docs/wordpress/wp-content/themes/twentyfifteen/functions.php on
line 73

I get this error with every theme and even with all my plugins disabled .

Answer

$path = $_SERVER[‘HTTP_HOST’] . $_SERVER[REQUEST_URI];

to

$path = $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];