original_string: public function field_validation($values) {
          $valuecount = 0;
          // The lat long class has two values that need to be checked.
          foreach ($values as $value) {
              if (isset($value->value) && !($value->value == '')) {
                  $valuecount++;
              }
          }
          // If we have nothing filled in or both filled in then everything is okay.
          if ($valuecount == 0 || $valuecount == 2) {
              return false;
          }
          // If we get here then only one field has been filled in.
          return get_string('latlongboth', 'data');
      }
code: public function field_validation($values) {
          $valuecount = 0;
          // The lat long class has two values that need to be checked.
          foreach ($values as $value) {
              if (isset($value->value) && !($value->value == '')) {
                  $valuecount++;
              }
          }
          // If we have nothing filled in or both filled in then everything is okay.
          if ($valuecount == 0 || $valuecount == 2) {
              return false;
          }
          // If we get here then only one field has been filled in.
          return get_string('latlongboth', 'data');
      }
code_tokens: public function field_validation ( $ values ) { $ valuecount = 0 ; // The lat long class has two values that need to be checked. foreach ( $ values as $ value ) { if ( isset ( $ value -> value ) && ! ( $ value -> value == '' ) ) { $ valuecount ++ ; } } // If we have nothing filled in or both filled in then everything is okay. if ( $ valuecount == 0 || $ valuecount == 2 ) { return false ; } // If we get here then only one field has been filled in. return get_string ( 'latlongboth' , 'data' ) ; }
docstring: Validate values for this field.
  Both the Latitude and the Longitude fields need to be filled in.
  
  @param array $values The entered values for the lat. and long.
  @return string|bool Error message or false.
docstring_tokens: Validate values for this field . Both the Latitude and the Longitude fields need to be filled in .