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.
I have problem with php code connecting to MySQL
You can not mix mysql_* and mysqli_* functions, they are two different APIs. The mysql_* functions have been deprecated and should no longer be used. mysqli_* doesn't have an equivalent function, but you can do mysqli_query($link_id, 'SHOW DATABASES') and then iterate over the results. See mysqli_query() for examples.
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