What is the role of a Manager class in handling multiple instances of objects in PHP, especially in relation to database operations?

When dealing with multiple instances of objects in PHP, especially in relation to database operations, a Manager class can be used to handle the creation, retrieval, updating, and deletion of objects. This class acts as a centralized point for managing the interactions between the application code and the database, providing a layer of abstraction that simplifies the process of working with multiple instances of objects. 

<?php
class ObjectManager {
    private $dbConnection;

    public function __construct($dbConnection) {
        $this->dbConnection = $dbConnection;
    }

    public function getObjectById($id) {
        // Database query to retrieve object by ID
    }

    public function saveObject($object) {
        // Database query to save object
    }

    public function updateObject($object) {
        // Database query to update object
    }

    public function deleteObject($object) {
        // Database query to delete object
    }
}

// Example of how to use the ObjectManager class
$dbConnection = new PDO("mysql:host=localhost;dbname=test", "username", "password");
$objectManager = new ObjectManager($dbConnection);

$object = $objectManager->getObjectById(1);
$object->setProperty("new value");
$objectManager->updateObject($object);
$objectManager->deleteObject($object);
?>

Keywords

Manager class multiple instances objects database operations PHP

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