whatever.php

<?php

class Container {

	static protected
	$Instance;
	
	////////
	
	static public function
	Init(?string $Input=NULL):
	self {
	
		if(!isset(self::$Instance))
		self::$Instance = self::New($Input);
		
		return self::$Instance;
	}
	
	static public function
	New(?string $Input=NULL):
	self {
	
		$Output = new self;
		$Output->DoSomethingWithTheInputMaybe($Input);
		
		return $Output;
	}
	
};