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<?php interface I { } class C { const FOO = I::FOO; public $options = [self::FOO => "bar"]; } try { var_dump((new C)->options); } catch (Throwable $e) {} var_dump((new C)->options);
Output for 8.3.0 - 8.3.4, 8.3.6
Fatal error: Uncaught Error: Undefined constant I::FOO in /in/HgKbi:7 Stack trace: #0 /in/HgKbi(16): [constant expression]() #1 {main} thrown in /in/HgKbi on line 7
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Fatal error: Uncaught Error: Undefined constant I::FOO in /in/HgKbi:7 Stack trace: #0 /in/HgKbi(16): [constant expression]() #1 {main} thrown in /in/HgKbi on line 7
Process exited with code 255.
Output for 8.2.0 - 8.2.18
Fatal error: Uncaught Error: Undefined constant I::FOO in /in/HgKbi:7 Stack trace: #0 {main} thrown in /in/HgKbi on line 7
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Fatal error: Uncaught Error: Undefined constant I::FOO in /in/HgKbi:16 Stack trace: #0 {main} thrown in /in/HgKbi on line 16
Process exited with code 255.
Output for 7.0.21 - 7.0.33, 7.1.7 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught Error: Undefined class constant 'I::FOO' in /in/HgKbi:16 Stack trace: #0 {main} thrown in /in/HgKbi on line 16
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.6
UNKNOWN:0
Output for 5.6.38
Fatal error: Undefined class constant 'I::FOO' in /in/HgKbi on line 13
Process exited with code 255.

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