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<?php print_r(unserialize('a:2:{s:4:"cols";i:1;s:4:"rows";a:1:{i:1;a:1:{s:3:"tot";i:1;}}}'));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
Array ( [cols] => 1 [rows] => Array ( [1] => Array ( [tot] => 1 ) ) )