Dependency Injection: a discussion of the pros and cons

General Web Dev
66

This is a flat out lie.

This:

class Foo {

}

class Bar { 
	public function __construct(Foo $foo) {
		$this->foo = $foo;
	}
}

new Bar(new Foo);

is fewer lines of code, less complex and fewer method calls executed than

class Foo {
	private static $instance;

	public static function getInstance() {
		if (empty(self::$instance)) {
			 self::$instance = new Foo;
		}

		return self::$instance;
	}
}

class Bar { 
	public function __construct() {
		$this->foo = Foo::getInstance();
	}
}

new Bar();
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