- define: documentation ( source)
<?php
namespace Foo {
define('Foo\\null', true, true);
define('Foo\\false', true, true);
//define("Foo\\M_PI", 413, true);
echo 'null:';if (null) echo "TRUE";else echo "FALSE";
echo ' false:';if (false) echo "TRUE";else echo "FALSE";
echo ' true:';if (true) echo "TRUE";else echo "FALSE";
echo ' M_PI:'.M_PI.' π';
}