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@ 2015-11-10T19:07:38Z

<?php

$b = [1, 2, 3];

foreach($b ?: [] as &$v){
   $v = $v*2;
   unset($v);
}

var_dump($b);

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

27.32 ms | 404 KiB | 5 Q