How to Convert Boolean to String

Question

I have a Boolean variable which I want to convert to a string:

$res = true;

I need the converted value to be of the format: \"true\"

Answer 1

Another way to do : json_encode( booleanValue )

echo json_encode(true);  // string "true"

echo json_encode(false); // string "false"

// null !== false
echo json_encode(null);  // string "null"