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<?php class Foo { function __toString() { throw new Exception(); } } echo new Foo;
Output for 5.6.0 - 5.6.40, 7.0.0
Fatal error: Method Foo::__toString() must not throw an exception in /in/BhPiN on line 0
Process exited with code 255.
Output for 7.0.1 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33
Fatal error: Method Foo::__toString() must not throw an exception, caught Exception: in /in/BhPiN on line 0
Process exited with code 137.
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
Fatal error: Uncaught Exception in /in/BhPiN:7 Stack trace: #0 /in/BhPiN(11): Foo->__toString() #1 {main} thrown in /in/BhPiN on line 7
Process exited with code 255.

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