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<?php class Test { function __construct(){echo 'a';} } new ${!${''}='Test'}; new ${$a = 'Test'};
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
a Warning: Undefined variable $Test in /in/55pN0 on line 9 Fatal error: Uncaught Error: Class name must be a valid object or a string in /in/55pN0:9 Stack trace: #0 {main} thrown in /in/55pN0 on line 9
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, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33
a Notice: Undefined variable: Test in /in/55pN0 on line 9 Fatal error: Uncaught Error: Class name must be a valid object or a string in /in/55pN0:9 Stack trace: #0 {main} thrown in /in/55pN0 on line 9
Process exited with code 255.
Output for 7.3.32 - 7.3.33
a Fatal error: Uncaught Error: Class name must be a valid object or a string in /in/55pN0:9 Stack trace: #0 {main} thrown in /in/55pN0 on line 9
Process exited with code 255.
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
a Notice: Undefined variable: Test in /in/55pN0 on line 9 Fatal error: Class name must be a valid object or a string in /in/55pN0 on line 9
Process exited with code 255.

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