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<?php var_dump(new DateTimeImmutable() instanceof Jsonserializeable); var_dump(new DateTime() instanceof JsonSerializeable); // And this works even without it... // ----------- class Test extends DateTime implements JsonSerializeable { public function jsonSerialize() { return "called"; } } var_dump(json_encode(new DateTime('2015-05-03')));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
bool(false) bool(false) Fatal error: Uncaught Error: Interface "JsonSerializeable" not found in /in/r3SoZ:9 Stack trace: #0 {main} thrown in /in/r3SoZ on line 9
Process exited with code 255.
Output for 7.4.0 - 7.4.33
bool(false) bool(false) Fatal error: Uncaught Error: Interface 'JsonSerializeable' not found in /in/r3SoZ:9 Stack trace: #0 {main} thrown in /in/r3SoZ on line 9
Process exited with code 255.
Output for 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 - 7.2.33, 7.3.0 - 7.3.33
bool(false) bool(false) Fatal error: Interface 'JsonSerializeable' not found in /in/r3SoZ on line 9
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45
Fatal error: Class 'DateTimeImmutable' not found in /in/r3SoZ on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/r3SoZ 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 in /in/r3SoZ on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/r3SoZ on line 3
Process exited with code 255.

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