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<?php print_r(unserialize('a:1:{s:13:"introduced_by";a:3:{s:4:"date";s:10:"1998-07-31";s:6:"number";s:8:"147-ФЗ";s:7:"type_id";i:190;}}'));
Output for 4.3.0 - 7.1.0
Array ( [introduced_by] => Array ( [date] => 1998-07-31 [number] => 147-ФЗ [type_id] => 190 ) )