
        "hello $world";

echo "hello {$world['bar']}";

echo "hello {$world->bar}";

echo "hello {$world["${bar['baz']}"]}";

echo "hello {${world->{${'bar'}}}}";
        ]]>


        "hello ${world}";

echo "hello ${world['bar']}";

echo "hello ${world->bar}";

echo "hello ${world["${bar['baz']}"]}";

echo "hello ${world->{${'bar'}}}";
        ]]>