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<?php foo((unset) $x);
based on Q2BOk
Output for 7.2.0
Deprecated: The (unset) cast is deprecated in /in/T0SLo on line 3 Fatal error: Uncaught Error: Call to undefined function foo() in /in/T0SLo:3 Stack trace: #0 {main} thrown in /in/T0SLo on line 3
Process exited with code 255.
Output for 7.0.0 - 7.1.10
Fatal error: Uncaught Error: Call to undefined function foo() in /in/T0SLo:3 Stack trace: #0 {main} thrown in /in/T0SLo on line 3
Process exited with code 255.
Output for 5.3.21 - 5.6.28
Fatal error: Call to undefined function foo() in /in/T0SLo on line 3
Process exited with code 255.