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<?php class SomeClass implements JsonSerializable { public function jsonSerialize() { return [get_object_vars($this)]; } } $class = new SomeClass; var_dump(json_encode($class)); var_dump(json_last_error() == JSON_ERROR_RECURSION); $arr = [$class]; var_dump(json_encode($arr)); var_dump(json_last_error() == JSON_ERROR_RECURSION);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Deprecated: Return type of SomeClass::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/cZlaa on line 4 string(4) "[[]]" bool(false) string(6) "[[[]]]" bool(false)
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Deprecated: Return type of SomeClass::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/cZlaa on line 4 string(4) "[[]]" bool(false) string(6) "[[[]]]" bool(false)
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.6 - 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(4) "[[]]" bool(false) string(6) "[[[]]]" bool(false)
Output for 7.0.0 - 7.0.5
string(4) "[[]]" bool(false) bool(false) bool(true)
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166.8 ms | 401 KiB | 237 Q