Simple chain sample for a friend

chain.php

<?php

class Chain 
{
    public static function foo() {
        echo "foo\n";
        return new Chain; //or return new static;
    }
    public function bar() 
    {
        echo "bar\n";
        return $this;
    }
    public function baz() 
    {
        echo "baz\n";
        return $this;
    }
}

Chain::foo()->bar()->baz();