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<?php var_dump(unserialize('a:2:{i:0;s:0:"";i:1;s:0:"";}'));
based on m8PDU
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
array(2) { [0]=> string(0) "" [1]=> string(0) "" }