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<?php class Foo { public function __toString() { return debug_backtrace(); } } $foo = new Foo(); echo $foo; echo $foo->__toString();
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: Foo::__toString(): Return value must be of type string, array returned in /in/H9Mjg:6 Stack trace: #0 /in/H9Mjg(13): Foo->__toString() #1 {main} thrown in /in/H9Mjg on line 6
Process exited with code 255.

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