PHP Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /var/www/html/index.php:27
Stack trace:
#0 /var/www/html/functions.php(15): connect_db()
#1 /var/www/html/admin/index.php(5): include('/var/www/html/f...')
#2 {main}
thrown in /var/www/html/index.php on line 27

PHP Warning: include(config.php): failed to open stream: No such file or directory in /var/www/html/index.php on line 3
PHP Warning: include(): Failed opening 'config.php' for inclusion (include_path='.:/usr/share/php') in /var/www/html/index.php on line 3

PHP Warning: file_get_contents(): SSL operation failed with code 1. OpenSSL Error messages: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed in /var/www/html/lib/Request.php on line 42

PHP Fatal error: Uncaught PDOException: SQLSTATE[HY000] [2002] Connection refused in /var/www/html/database.php:14
Stack trace:
#0 /var/www/html/database.php(14): PDO->__construct('mysql:host=127....', 'dbuser', '********')
#1 /var/www/html/index.php(7): require_once('/var/www/html/d...')
#2 {main}
thrown in /var/www/html/database.php on line 14

PHP Warning: require_once(vendor/autoload.php): failed to open stream: No such file or directory in /var/www/html/index.php on line 3

PHP Notice: Undefined index: username in /var/www/html/admin/login.php on line 15
PHP Notice: Undefined index: password in /var/www/html/admin/login.php on line 16

PHP Warning: session_start(): Cannot start session when headers already sent in /var/www/html/lib/Session.php on line 5

PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 16384 bytes) in /var/www/vendor/doctrine/orm/lib/Doctrine/ORM/QueryBuilder.php on line 312

PHP Fatal error: Uncaught Error: Class 'PDO' not found in /var/www/html/includes/database.php:10