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<?php set_error_handler(function () { return false; }); class Test { public function __toString() { return 42; } } echo (new Test);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
42
Output for 7.4.0 - 7.4.33
Fatal error: Uncaught Error: Method Test::__toString() must return a string value in /in/e7dIF:11 Stack trace: #0 {main} thrown in /in/e7dIF on line 11
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Recoverable fatal error: Method Test::__toString() must return a string value in /in/e7dIF on line 11
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33
Catchable fatal error: Method Test::__toString() must return a string value in /in/e7dIF on line 11
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/e7dIF on line 3
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, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION, expecting ')' in /in/e7dIF on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/e7dIF on line 3
Process exited with code 255.

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