3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php class a { const a = b::c; const b = a::a; } class b { const c = a::d; const d = a::b; } var_dump(A::a, A::b, B::c, B::d);
Output for 7.0.0 - 7.1.0
Fatal error: Uncaught Error: Undefined class constant 'a::d' in /in/udA9Y:13 Stack trace: #0 {main} thrown in /in/udA9Y on line 13
Process exited with code 255.
Output for hhvm-3.12.0

Process exited with code 137.
Output for hhvm-3.10.0
Fatal error: Couldn't find constant a::d in /in/udA9Y on line 9
Process exited with code 255.
Output for 5.2.4 - 5.6.28
Fatal error: Undefined class constant 'a::d' in /in/udA9Y on line 13
Process exited with code 255.
Output for 5.0.0 - 5.2.3
Notice: Use of undefined constant a::d - assumed 'a::d' in /in/udA9Y on line 13 string(4) "a::d" string(4) "a::d" string(4) "a::d" string(4) "a::d"
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/udA9Y on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_CONST, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/udA9Y 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/udA9Y on line 4
Process exited with code 255.