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Modify file of 'system/libraries/Form_validation.php':
in the function "public function run($group = '')",before _execute action add codes like this:
...
if(in_array('required',$row['rules']) and is_array($row['postdata'])){
$row['postdata'] = json_encode($row['postdata'],JSON_UNESCAPED_UNICODE);
}
...
$this->_execute($row, $row['rules'], $row['postdata']);
