How to Convert Boolean to String

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" "false", not "0" "1"

$converted_res = "true";
$converted_res = "false";

I've tried:

$converted_res = string($res);
$converted_res = String($res);

But it tells me that string and String are not recognized functions.
How do I convert this Boolean to a string in the format of "true" or "false" in PHP?

Solution 1:

Simplest solution:

$converted_res = $res ? 'true' : 'false';

Solution 2:

The function var_export returns a string representation of a variable, so you could do this:

var_export($res, true);

The second argument tells the function to return the string instead of echoing it.

Solution 3:

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"

Solution 4:

See var_export