Online PHP editor | refs for jihkF

<?php namespace RedefinedConstants { // redefining global namespace constants has no effect define('NULL', 'I am not global NULL!'); define('TRUE', 'I am not global TRUE!'); define('FALSE', 'I am not global FALSE!'); // redefining local namespace constants will work define('RedefinedConstants\NULL', 'I am not NULL!', \TRUE); define('RedefinedConstants\FALSE', 'I am not FALSE!', \TRUE); define('RedefinedConstants\TRUE', 'I am not TRUE!', \TRUE); var_dump( NULL, \NULL, null, \null, Null, \Null, FALSE, \FALSE, false, \false, False, \False, TRUE, \TRUE, true, \true, True, \True ); }