Essential Books

Close connection

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When we are finished querying the database, it is recommended to close the connection to free up resources.

Object oriented style 

$conn->close();

Procedural style 

mysqli_close($conn);

Note: The connection to the server will be closed as soon as the execution of the script ends, unless it’s closed earlier by explicitly calling the close connection function.

Use Case: If our script has a fair amount of processing to perform after fetching the result and has retrieved the full result set, we definitely should close the connection. If we were not to, there’s a chance the MySQL server will reach its connection limit when the web server is under heavy use.

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PHP MySQLi:
* PHP MySQLi
* Close connection
* MySQLi connect
* Loop through MySQLi results
* Prepared statements in MySQLi
* Escaping Strings
* MySQLi query
* Debugging SQL in MySQLi
* How to get data from a prepared statement
* MySQLi Insert ID
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