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            // With an array of values, we need multiple placeholders and the

            // 'IN' operator is implicit.

            foreach ($info['value'] as $value) {

              $arguments[$placeholder_i] = $value;

            }

          else {

            // With a single value, the '=' operator is implicit.

            $operator = !empty($info['operator']) ? $info['operator'] : '=';

            $arguments[$placeholder] = $info['value'];

          }

          $extras[] = "$join_table$info[field] $operator $placeholder";

        }