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Classmate, official manual link: http://php.net/manual/zh/mysqli.set-charset.php
bool mysqli_set_charset ( mysqli $link , string $charset ), requires two parameters. Your problem should be caused by failure to connect to the database, so you can test whether the connection to the database is successful
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Classmate, official manual link: http://php.net/manual/zh/mysqli.set-charset.php
bool mysqli_set_charset ( mysqli $link , string $charset ), requires two parameters. Your problem should be caused by failure to connect to the database, so you can test whether the connection to the database is successful