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<?php function autoloader($class) { var_dump($class); } spl_autoload_register('autoloader'); class foo { const X = bar::X; } var_dump(foo::X);
Output for 8.3.0 - 8.3.4
string(3) "bar" Fatal error: Uncaught Error: Class "bar" not found in /in/LuMDL:7 Stack trace: #0 /in/LuMDL(9): [constant expression]() #1 {main} thrown in /in/LuMDL on line 7
Process exited with code 255.
Output for 8.2.0 - 8.2.17
string(3) "bar" Fatal error: Uncaught Error: Class "bar" not found in /in/LuMDL:7 Stack trace: #0 {main} thrown in /in/LuMDL on line 7
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27
string(3) "bar" Fatal error: Uncaught Error: Class "bar" not found in /in/LuMDL:9 Stack trace: #0 {main} thrown in /in/LuMDL on line 9
Process exited with code 255.
Output for 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
string(3) "bar" Fatal error: Uncaught Error: Class 'bar' not found in /in/LuMDL:9 Stack trace: #0 {main} thrown in /in/LuMDL on line 9
Process exited with code 255.
Output for 5.2.4 - 5.2.12, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.32, 7.1.0 - 7.1.24, 7.2.0 - 7.2.33
string(3) "bar" Fatal error: Class 'bar' not found in /in/LuMDL on line 9
Process exited with code 255.
Output for 5.2.13 - 5.2.17
string(3) "bar" Fatal error: Undefined class constant 'bar::X' in /in/LuMDL on line 9
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.3
string(3) "bar" Notice: Use of undefined constant bar::X - assumed 'bar::X' in /in/LuMDL on line 9 string(6) "bar::X"
Output for 5.0.0 - 5.0.5
Fatal error: Call to undefined function spl_autoload_register() in /in/LuMDL on line 4
Process exited with code 255.
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/LuMDL on line 7
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/LuMDL on line 7
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/LuMDL on line 7
Process exited with code 255.

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