PHP Slim, issue when returning a response

Solution:

Solved! Must be written like this:

$response->getBody()->write(json_encode($person));
return $response;

Solution:

You want:

$response->write() 

That method returns the response object. Internally it calls $response->getBody()->write()

Solution:

According to the Psr\Http\Message\StreamInterface specs, the write() method looks like this:

/**
 * Write data to the stream.
 *
 * @param string $string The string that is to be written.
 * @return int Returns the number of bytes written to the stream.
 * @throws \RuntimeException on failure.
 */
public function write($string);

So it doesn't return the instance, it just returns a byte count. I suspect you were relying on getting some kind of fluent interface.