note 108236 added to language.namespaces.faq

There is a way to define a namespaced constant that is a special, built-in constant, using define function and setting the third parameter case_insensitive to false: <?php namespace foo; define(__NAMESPACE__ . '\NULL', 10); // defines the constant NULL in the current namespace var_dump(NULL); // will show 10 var_dump(null); // will show NULL ?> No need to specify the namespace in your call to define(), like it happens usually <?php namespace foo; define(INI_ALL, 'bar'); // produces notice - Constant INI_ALL already defined. But: define(__NAMESPACE__ . '\INI_ALL', 'bar'); // defines the constant INI_ALL in the current namespace var_dump(INI_ALL); // will show string(3)"bar". Nothing unespected so far. But: define('NULL', 10); // defines the constant NULL in the current namespace... var_dump(NULL); // will show 10 var_dump(null); // will show NULL ?> If the parameter case_insensitive is set to true <?php namespace foo; define (__NAMESPACE__ . '\NULL', 10, true); // produces notice - Constant null already defined ?> ---- Server IP: 69.147.83.197 Probable Submitter: 92.84.32.139 ---- Manual Page -- http://www.php.net/manual/en/language.namespaces.faq.php Edit -- https://master.php.net/note/edit/108236 Del: integrated -- https://master.php.net/note/delete/108236/integrated Del: useless -- https://master.php.net/note/delete/108236/useless Del: bad code -- https://master.php.net/note/delete/108236/bad+code Del: spam -- https://master.php.net/note/delete/108236/spam Del: non-english -- https://master.php.net/note/delete/108236/non-english Del: in docs -- https://master.php.net/note/delete/108236/in+docs Del: other reasons-- https://master.php.net/note/delete/108236 Reject -- https://master.php.net/note/reject/108236 Search -- https://master.php.net/manage/user-notes.php