Can I mix MySQL APIs in PHP?

No, you can't use mysql and mysqli together. They are separate APIs and the resources they create are incompatible with one another.

There is a mysqli_close, though.

Just to give a general answer here about all three MYSQL API's with a reference:

You can't mix any of the three (mysql_*, mysqli_*, PDO) MYSQL API's from PHP together, it just doesn't work. It's even in the manual FAQ:

It is not possible to mix the extensions. So, for example, passing a mysqli connection to PDO_MySQL or ext/mysql will not work.

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You need to use the same MySQL API and its related functions, from connection to querying.

• http://php.net/manual/en/mysqlinfo.api.choosing.php