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run code in 150+ php & hhvm versions
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<?php $testArray = array('c' => array(1, 2, 3, 'd' => array('e', 'f', 'g'))); $testArray = array_shift($testArray); print_r($testArray);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 1 [1] => 2 [2] => 3 [d] => Array ( [0] => e [1] => f [2] => g ) )
Output for hhvm-3.10.0

Process exited with code 153.