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<?php var_dump(constant('\\test\\true'));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught Error: Undefined constant "test\true" in /in/3QOie:3 Stack trace: #0 /in/3QOie(3): constant('\\test\\true') #1 {main} thrown in /in/3QOie on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.21, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
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

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225.19 ms | 401 KiB | 311 Q