How Does PDO Close Connections?

Understanding PDO Connection Closing

In comparison to the MySQLi extension, PDO offers a distinct approach to managing connections. Unlike MySQLi, which employs a specific ->close() method to terminate a connection, PDO opts for a simpler mechanism.

PDO initiates connections through the new PDO() constructor. To close a connection, however, it utilizes a straightforward assignment of null to the connection object:

<code class="php">$this->connection = null;</code>

This action immediately terminates the PDO connection by resetting the connection reference to null. This method of connection closure is both straightforward and effective. However, it is important to note that PDO also provides a mechanism for persistent connections, which do not automatically close at the end of a script's execution.

Therefore, when working with PDO connections, it is crucial to be aware of these two distinct types: regular and persistent connections. While regular connections can be closed explicitly via the null assignment described above or automatically at the end of a script, persistent connections require manual closure to prevent resource leaks.

The above is the detailed content of How Does PDO Close Connections?. For more information, please follow other related articles on the PHP Chinese website!