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<?php class Foo { public function __toString() { return []; } } echo new Foo();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
Fatal error: Uncaught TypeError: Foo::__toString(): Return value must be of type string, array returned in /in/E41eb:5 Stack trace: #0 /in/E41eb(9): Foo->__toString() #1 {main} thrown in /in/E41eb on line 5
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Fatal error: Uncaught Error: Method Foo::__toString() must return a string value in /in/E41eb:9 Stack trace: #0 {main} thrown in /in/E41eb on line 9
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Recoverable fatal error: Method Foo::__toString() must return a string value in /in/E41eb on line 9
Process exited with code 255.

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