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Disconnecting from MySQL

Even though it is important to understand the process of connecting to the MySQL server itself, it is also
important to terminate the MySQL connection properly to ensure that there is no possibility of a connection
remaining open beyond the need (which of course could become a security concern). If there is no specific
termination function to the MySQL server, PHP's garbage collection feature will close the connection when
the script terminates. There are two ways to close a connection to the MySQL server.

• mysql_close($link_id) - This use of the mysql_close() function, which would include the $link_id
of the connection resource that connected PHP to the mysql server would be closed. By identifying
the $link_id, PHP looks for that connection to the MySQL server to close.

mysql_close($link_id)

• mysql_close() - This use of the mysql_close() function, which does not include the $link_id, the most
recently open link is assumed.

mysql_close()
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