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<?php $array = 'a:3:{i:0;s:3:"hej";i:1;i:123;i:2;s:7:"med dig";}'; var_dump(unserialize($array));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(3) "hej" [1]=> int(123) [2]=> string(7) "med dig" }