How can an instance of a class be created within another class in PHP?

To create an instance of a class within another class in PHP, you can simply instantiate the class within the constructor or a method of the outer class. This allows you to access the properties and methods of the inner class within the outer class. 

class InnerClass {
    public function __construct() {
        echo "Inner class instance created";
    }
}

class OuterClass {
    public $innerInstance;

    public function __construct() {
        $this->innerInstance = new InnerClass();
    }
}

$outer = new OuterClass();

Keywords

PHP class instance object-oriented programming composition

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