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<?php

/*
 * Define a namespace in which this code will be run.
 * 
 * @see http://php.net/manual/en/language.namespaces.rationale.php
 */
namespace tutorial\hello;

/*
 * Import the predefined line ending constant which will differ depending
 * on the system on which this code is executed.
 * Since this is a predefined constant it is imported from the root namespace.
 * 
 * @see http://php.net/manual/fa/reserved.constants.php
 */
use \PHP_EOL;

/*
 * Use the echo language construct to return a string to STDOUT.
 * By using single parentheses the string contents will not be processed by
 * the PHP interpreter, and when using the PHP_EOL constant the output will
 * be correct on whatever system this script is run.
 *
 * @see http://php.net/manual/en/function.echo.php
 */
echo 'Hello world' . PHP_EOL;