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run code in 200+ php & hhvm versions
Bugs & Features
<?php $o=(object)array();$o->o = $o;print_r($o);
Output for 5.0.0 - 7.2.0
stdClass Object ( [o] => stdClass Object *RECURSION* )
Output for 4.3.0 - 4.4.9
stdClass Object ( [o] => stdClass Object ( ) )