douyan1244 2018-09-26 00:17
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PHP Late Binding Static与私有__construct

I have an abstract class that has a function which uses PHP's Late Static Binding, as follows:

abstract class MetaComponent {
    public static function do(...$args) {
        return new static(...$args);
    }
}

Then, I implemented the abstract class this way:

class ¬Text extends MetaComponent {
    private function __construct(string $text) {
        $this->text = $text;
    }

    public function render() {
        echo $this->text;
    }
}

My intention was that no one could instantiate ¬Text directly, so I made the __construct function private. However, anyone should be able to instantiate it through ¬Text::do('Lorem Ipsum'). This is why I used Late Binding Static within MetaComponent::do().

However, I get the following error:

PHP Fatal error: Uncaught Error: Call to private ¬Text::__construct() from context 'MetaComponent' in /xxx/MetaComponent.php:9

Is there a way to call the constructor from the abstract class while preventing __construct from being called directly?

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