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run code in 150+ php & hhvm versions
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<?php echo serialize((object) array('blaa'=> 7, 'meuhee' => 88));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
O:8:"stdClass":2:{s:4:"blaa";i:7;s:6:"meuhee";i:88;}