Should I Explicitly Close MySQL Connections in PHP?

Importance of Closing MySQL Connections

Question: Should MySQL connections be explicitly closed, or do they automatically close after executing the PHP script?

Answer: According to the MySQL documentation, connections are automatically closed when the script execution ends, unless explicitly closed using mysql_close().

Significance: Closing connections manually is crucial to prevent the MySQL server from reaching its connection limit under heavy server load.

Script with Delayed Processing: If the script involves significant processing after fetching results, it's highly recommended to explicitly close the connection. This prevents the server from holding connections for extended periods.

FastCGI Involvement: Some sources claim that PHP with FastCGI support automatically establishes persistent connections, even with mysql_connect. However, it's safer and cleaner to use mysql_close().

Recommendation: For optimal efficiency and performance, explicitly close MySQL connections after retrieving data or using PDO if available.

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