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run code in 150+ php & hhvm versions
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<?php $o=(object)array();$o->o=$o;$o->p=(object)array();var_export($o);
based on 92kon
Output for 5.4.7 - 5.6.21, 7.0.0 - 7.1.0
Warning: var_export does not handle circular references in /in/7oOJO on line 1 stdClass::__set_state(array( 'o' => NULL, 'p' => stdClass::__set_state(array( )), ))
Output for 5.2.14 - 5.2.17, 5.3.3 - 5.4.6, hhvm-3.12.0
Fatal error: Nesting level too deep - recursive dependency? in /in/7oOJO on line 1
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0 - 5.2.13, 5.3.0 - 5.3.2
stdClass::__set_state(array( 'o' => stdClass::__set_state(array( 'o' => stdClass::__set_state(array( 'o' => stdClass::__set_state(array( Fatal error: Nesting level too deep - recursive dependency? in /in/7oOJO on line 1
Process exited with code 255.
Output for 5.0.0 - 5.0.5
class stdClass { public $o = class stdClass { public $o = class stdClass { public $o = class stdClass { Fatal error: Nesting level too deep - recursive dependency? in /in/7oOJO on line 1
Process exited with code 255.
Output for 4.3.0 - 4.4.9
class stdClass { var $o = class stdClass { }; var $p = class stdClass { }; }