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run code in 150+ php & hhvm versions
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<?php $a = array('contract' => 1); $b = !empty($a['xxx']) ? $a['xx'] : 'ble'; var_dump($b);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(3) "ble"