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Fatal error: Uncaught ArgumentCountError: mysqli_close() expects exactly 1 argument, 0 given in /homepages/26/d253275506/htdocs/book.php:16
Stack trace:
#0 /homepages/26/d253275506/htdocs/book.php(16): mysqli_close()
#1 {main}
thrown in /homepages/26/d253275506/htdocs/book.php on line 16