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run code in 200+ php & hhvm versions
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<?php var_dump(constant('\\test\\true'));
based on cmhDG
Output for 4.3.2 - 7.2.0
Warning: constant(): Couldn't find constant \test\true in /in/3QOie on line 3 NULL
Output for 4.3.0 - 4.3.1
Warning: constant() [http://www.php.net/function.constant]: Couldn't find constant \test\true in /in/3QOie on line 3 NULL