What are some alternative methods, such as using anonymous functions, for managing class instances in PHP without external dependencies?

When managing class instances in PHP without external dependencies, one alternative method is to use anonymous functions to create and store instances dynamically. This approach allows for more flexibility and control over the instantiation process without relying on external libraries or frameworks. 

// Using anonymous functions to manage class instances

class MyClass {
    private $instances = [];

    public function getInstance($key, $callback) {
        if (!isset($this->instances[$key])) {
            $this->instances[$key] = $callback();
        }

        return $this->instances[$key];
    }
}

// Example usage
$myClass = new MyClass();

$instance1 = $myClass->getInstance('instance1', function() {
    return new SomeClass();
});

$instance2 = $myClass->getInstance('instance2', function() {
    return new AnotherClass();
});

Keywords

anonymous functions class instances PHP external dependencies alternative methods

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