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<?php var_dump(unserialize('O:8:"stdClass":0:{}')); var_dump(unserialize('O:10:"Reflection":0:{}'));
Output for 5.0.0 - 7.1.0
object(stdClass)#1 (0) { } object(Reflection)#1 (0) { }
Output for 4.3.0 - 4.4.9
object(stdClass)(0) { } object(__PHP_Incomplete_Class)(1) { ["__PHP_Incomplete_Class_Name"]=> string(10) "reflection" }