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Warning: mysqli::prepare(): Couldn't fetch mysqli in /opt/www/internett/php/PHP_Book/eksempler/ch14 - Authenticating Your Users/listing14-10.php on line 12

Fatal error: Uncaught Error: Call to a member function bind_param() on bool in /opt/www/internett/php/PHP_Book/eksempler/ch14 - Authenticating Your Users/listing14-10.php:13 Stack trace: #0 {main} thrown in /opt/www/internett/php/PHP_Book/eksempler/ch14 - Authenticating Your Users/listing14-10.php on line 13