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<?php class A { const c = D::c; } $a = new A; class D { const c = A::c; } print_r($a);
Output for 8.3.0 - 8.3.6
Fatal error: Uncaught Error: Cannot declare self-referencing constant D::c in /in/GLPWA:4 Stack trace: #0 /in/GLPWA(6): [constant expression]() #1 {main} thrown in /in/GLPWA on line 4
Process exited with code 255.
Output for 8.2.0 - 8.2.18
Fatal error: Uncaught Error: Cannot declare self-referencing constant D::c in /in/GLPWA:4 Stack trace: #0 {main} thrown in /in/GLPWA on line 4
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Fatal error: Uncaught Error: Cannot declare self-referencing constant D::c in /in/GLPWA:6 Stack trace: #0 {main} thrown in /in/GLPWA on line 6
Process exited with code 255.
Output for 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
Fatal error: Uncaught Error: Cannot declare self-referencing constant 'D::c' in /in/GLPWA:6 Stack trace: #0 {main} thrown in /in/GLPWA on line 6
Process exited with code 255.
Output for 5.2.4 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28
Fatal error: Cannot declare self-referencing constant 'D::c' in /in/GLPWA on line 6
Process exited with code 255.
Output for 5.1.3 - 5.1.6, 5.2.0 - 5.2.3

Process exited with code 139.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.2
A Object ( )
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_CONST, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/GLPWA on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_CONST, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/GLPWA on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/GLPWA on line 4
Process exited with code 255.

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