Online PHP editor | refs for IBEBs

<?php namespace Foo; //define('Foo\\null', true, true); //define('Foo\\false', true, true); define("Foo\\\x31", false, true); echo 'null:';if (null) echo "TRUE";else echo "FALSE"; echo "\nfalse:";if (false) echo "TRUE";else echo "FALSE"; echo "\ntrue:";if (true) echo "TRUE";else echo "FALSE"; echo "\n0:";if (0) echo "TRUE";else echo "FALSE"; echo "\n1:";if (1) echo "TRUE";else echo "FALSE";