mysqli_select_db（）预计正好有2个参数，在oscommerce中第22行的database.php中给出[1]

if ($$link) mysqli_select_db($database);

return $$link;
}

this is the code which is giving error.I am new to oscommerce

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Take a look at http://php.net/manual/en/mysqli.select-db.php:

bool mysqli_select_db ( mysqli $link , string $dbname )

There are two parameters mysqli $link and string $dbname required.