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Warning: mysqli::stmt_init(): Couldn't fetch mysqli in /opt/www/internett/php/PHP_Book/eksempler/ch30 - Using PHP with MySQL/listing30_1.php on line 10

Fatal error: Uncaught Error: Call to a member function prepare() on bool in /opt/www/internett/php/PHP_Book/eksempler/ch30 - Using PHP with MySQL/listing30_1.php:13 Stack trace: #0 {main} thrown in /opt/www/internett/php/PHP_Book/eksempler/ch30 - Using PHP with MySQL/listing30_1.php on line 13