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run code in 150+ php & hhvm versions
Bugs & Features
<?php class C implements JsonSerializable { var $a = 'lol'; var $b = 'fa'; public function jsonSerialize() { $aux = clone($this); unset($aux->a); return $aux; } } echo json_encode(new C());
Output for 5.4.0 - 7.1.0

Process exited with code 139.
Output for 5.1.3 - 5.3.29
Fatal error: Interface 'JsonSerializable' not found in /in/TSgMV on line 4
Process exited with code 255.
Output for 5.0.5 - 5.1.2
Strict Standards: var: Deprecated. Please use the public/private/protected modifiers in /in/TSgMV on line 5 Strict Standards: var: Deprecated. Please use the public/private/protected modifiers in /in/TSgMV on line 6 Fatal error: Interface 'JsonSerializable' not found in /in/TSgMV on line 4
Process exited with code 255.
Output for 5.0.0 - 5.0.4
Strict Standards: var: Deprecated. Please use the public/private/protected modifiers in /in/TSgMV on line 5 Strict Standards: var: Deprecated. Please use the public/private/protected modifiers in /in/TSgMV on line 6 Fatal error: Class 'JsonSerializable' not found in /in/TSgMV on line 4
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/TSgMV on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting '{' in /in/TSgMV on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/TSgMV on line 4
Process exited with code 255.