get

elseif($field_key == 'sale_place_custom'){
   $spc_array = json_decode(htmlspecialchars_decode($field_value), true);
   $spc_ret = array();
   foreach($spc_array as $item_spc){
      $spc_ret[] = $item_spc['region'];
   }
   $ret['project']['sale_place_custom'] = $spc_ret;
}