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<?php class A implements JsonSerializable { public function jsonSerialize() { $this->className = __CLASS__; return $this; } } $a = new A(); $a->foo = 'bar'; $a->quuz = 'quuz'; var_dump(json_encode($a));
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: Return type of A::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/B4G8u on line 6 Deprecated: Creation of dynamic property A::$foo is deprecated in /in/B4G8u on line 13 Deprecated: Creation of dynamic property A::$quuz is deprecated in /in/B4G8u on line 14 Deprecated: Creation of dynamic property A::$className is deprecated in /in/B4G8u on line 7 string(43) "{"foo":"bar","quuz":"quuz","className":"A"}"
Output for 8.1.0 - 8.1.28
Deprecated: Return type of A::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/B4G8u on line 6 string(43) "{"foo":"bar","quuz":"quuz","className":"A"}"
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
string(43) "{"foo":"bar","quuz":"quuz","className":"A"}"
Output for 5.3.0 - 5.3.29
Fatal error: Interface 'JsonSerializable' not found in /in/B4G8u on line 4
Process exited with code 255.
Output for 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Fatal error: Interface 'JsonSerializable' not found in /in/B4G8u on line 3
Process exited with code 255.
Output for 5.0.0 - 5.0.4
Fatal error: Class 'JsonSerializable' not found in /in/B4G8u 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/B4G8u 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/B4G8u on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/B4G8u on line 3
Process exited with code 255.

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