What best practices should be followed when selecting databases with multiple MySQL connections in PHP?

When selecting databases with multiple MySQL connections in PHP, it is important to properly manage and close connections to avoid resource leaks and performance issues. One best practice is to use a connection pooling mechanism to efficiently manage connections and reuse them when needed. Additionally, using a framework or library that supports connection pooling can simplify the process and ensure proper handling of connections. 

// Example of using connection pooling with PDO in PHP
$pdoPool = new \PDO('mysql:host=localhost;dbname=database1', 'username', 'password');
$pdoPool->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);

// Retrieve a connection from the pool
$pdo1 = $pdoPool->query('SELECT * FROM table1');

// Use the connection for database operations

// Close the connection
$pdo1 = null;

// Retrieve another connection from the pool
$pdo2 = $pdoPool->query('SELECT * FROM table2');

// Use the connection for database operations

// Close the connection
$pdo2 = null;

// Close the connection pool
$pdoPool = null;

Keywords

MySQL PHP database connections best practices performance.

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