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run code in 150+ php & hhvm versions
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<?php $a=array(9,8,7,6); function modify(&$b) { $b[1]='x'; } modify($a); print_r($a);
Output for 4.3.0 - 7.1.0
Array ( [0] => 9 [1] => x [2] => 7 [3] => 6 )