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run code in 150+ php & hhvm versions
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<?php $one = array('key'=>'val'); $two = array(0=>array('key1'=>'val1'), 1=>array('key2'=>'val2')); var_dump(array_unshift($one, $two));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(2)