How to output single character text with php?

Question

I am implementing an API for some service that should return in the content only one character like '0' or '1' with no trailing or leading spaces or html tags.

I tried the following.

header( 'Content-Type:text/plain' );
echo "1";

and

header( 'Content-Type:text/plain' );
print "1";

I also tried to omit the header line, but I always get a new line character at the end of the output.

This is the output of php -v.

PHP 5.3.28 (cli) (built: Dec 15 2013 17:43:05)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2013 Zend Technologies

This is the output of httpd -v

Server version: Apache/2.2.23 (Unix)
Server built:   Nov 25 2012 15:00:50

Answer 1

Only this much code in a file will help :)

<?php echo 1;