如何通过从字符串创建类将参数传递给类

Question

My question title may be logically wrong, because I do not know how to explain it :)

Here are example of what I need. I have master classe and two another classes which this masters class creates. This two classes have constructors with parameters and I do not know how to pass this parameters.

class Master {

    function __construct() {
        $this->setup_settings();
        $this->load_classes();
    }

    public function setup_settings() {
        $this->settings['classes'] = array( 'Class_A', 'Class_B' );
    }

    public function load_classes() {
        foreach( $this->settings['classes'] as $class) {
            new $class; //Here are problem!
        }
    }

}

class Class_A {

    function __construct( $setiings ) {
        $this->settings = $settings;
    }

}
class Class_B {

    function __construct( $setiings ) {
        $this->settings = $settings;
    }

}

In this case I have an error:

Warning: Missing argument 1 for Class_A ::__construct()

I understanding why it is. But how to pass parameters to this class in this way (when class names are in array)? When I am creating string and passing it I have an error: class cant be converted to string.

Answer 1

You forgot the arguments in parens ($args).

$instance = new $objectName($args);

ClassA and ClassB both have constructors that expect a parameter called $settings. BTW, you misspelled it there.