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run code in 150+ php & hhvm versions
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<?php $a = new stdClass(); $tmp = (array) $a; if ($a == null) { echo "null"; print_r($a); } else if (empty($a)){ echo "empty"; print_r($a); }else if (!isset($a)){ echo "set"; print_r($a); } else if (var_dump(empty($tmp))) { echo "var_dump = true"; }
Output for 5.0.0 - 7.1.0
bool(true)
Output for 4.3.0 - 4.4.9
nullstdClass Object ( )