PHP Returning $this from __construct

gistfile1.php

// What can be done

class Foo {
	function echo( $string ) {
		echo $string;
		return $this;
	}
}

$foo = new Foo();
$foo->echo( 'foo' )->echo( 'bar' );

// What I want to do

class Foo {

	function __construct() {
		return $this;
	}

	function echo( $string ) {
		echo $string;
		return $this;
	}
}

$foo = new Foo()->echo( 'foo' )->echo( 'bar' );

// Solution?

/**
 * @return self
 */
public static function factory() {
	return new self();
}