How to Check Whether mysqli connection is open before closing it

Question

I am going to use mysqli_close($connection) to close the $connection. But Before Closing I need to ensure that the concerned connection is open.

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Answer 1

While some suggest to check for $connection->ping(),$connection->stat() or mysqli_thread_id($connection), the three will throw: 'Couldn't fetch mysqli' if the connection was closed before.

The solution that worked for me was:

if(is_resource($connection) && get_resource_type($connection)==='mysql link'){
    $connection->close(); //Object oriented style
    //mysqli_close($connection); //Procedural style 
}

PS: Checking only if it's a resource could be enough in a controlled context.