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<?php class Foo implements \JsonSerializable { public function jsonSerialize() { return new self; } } var_dump(json_encode(new Foo));
Output for 8.3.2 - 8.3.8
Deprecated: Return type of Foo::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/tLMv6 on line 4 Fatal error: Uncaught Error: Maximum call stack size of 8306688 bytes (zend.max_allowed_stack_size - zend.reserved_stack_size) reached. Infinite recursion? in /in/tLMv6:5 Stack trace: #0 [internal function]: Foo->jsonSerialize() #1 /in/tLMv6(9): json_encode(Object(Foo)) #2 {main} thrown in /in/tLMv6 on line 5
Process exited with code 255.
Output for 8.3.0 - 8.3.1
Deprecated: Return type of Foo::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/tLMv6 on line 4 Fatal error: Uncaught Error: Maximum call stack size of 8306688 bytes reached. Infinite recursion? in /in/tLMv6:5 Stack trace: #0 [internal function]: Foo->jsonSerialize() #1 /in/tLMv6(9): json_encode(Object(Foo)) #2 {main} thrown in /in/tLMv6 on line 5
Process exited with code 255.
Output for 8.1.0 - 8.1.29, 8.2.0 - 8.2.20
Deprecated: Return type of Foo::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/tLMv6 on line 4
Process exited with code 139.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30

Process exited with code 139.
Output for 5.3.0 - 5.3.29
Fatal error: Interface 'JsonSerializable' not found in /in/tLMv6 on line 3
Process exited with code 255.
Output for 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/tLMv6 on line 3 Fatal error: Interface 'JsonSerializable' not found in /in/tLMv6 on line 3
Process exited with code 255.
Output for 5.0.0 - 5.0.4
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/tLMv6 on line 3 Fatal error: Class 'JsonSerializable' not found in /in/tLMv6 on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/tLMv6 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
Parse error: parse error, unexpected T_STRING, expecting '{' in /in/tLMv6 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/tLMv6 on line 3
Process exited with code 255.

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