您可以使用下面的内容。基本上，在提交表单后，我们可以获得数据$entry 提取我们想要的值（在示例中$val1, $val2, $val3) 然后使用将该数据插入到自定义表中$wpdb:

add_action(\'gform_after_submission\', \'save_to_my_custom_table\', 10, 2);
function save_to_my_custom_table($entry, $form)
{
  global $wpdb;

  // update for your tablename (this assumes the table lives in same database as the other wp tables)
  $tablename = $wpdb->prefix . "my_custom_tablename";

  // grab from values from the entry
  $val1 = rgar( $entry, \'1\' );
  $val2 = rgar($entry, \'2\');
  $val3 = rgar($entry, \'3\');

  // basic insert
  $sql = "INSERT INTO `$tablename` (`val1`,`val1`, `val1`) values (%s, %s, %d)";

  // use a prepared statement
  $stmt = $wpdb->prepare($sql, $val1, $val2, $val3);

  // run the query
  $wpdb->query($stmt);
}

如果你想连接到一个完全在WP应用程序之外的数据库，我想你可能需要考虑设置一个API来进行两者之间的通信。在这种情况下，您仍然可以非常类似地处理此问题。见下文：

add_action(\'gform_after_submission\', \'save_to_my_custom_table\', 10, 2);
function save_to_my_custom_table($entry, $form)
{
  global $wpdb;

  // update for your tablename (this assumes the table lives in same database as the other wp tables)
  $tablename = $wpdb->prefix . "my_custom_tablename";

  // grab from values from the entry
  $val1 = rgar( $entry, \'1\' );
  $val2 = rgar($entry, \'2\');
  $val3 = rgar($entry, \'3\');

  // send POST reqest to API for other database
  $endpoint = \'api.example.com\';

  $body = [
      \'val1\'  => $val1,
      \'val2\'  => $val2,
      \'val3\'  => $val3,
  ];

  $body = wp_json_encode( $body );

  $options = [
      \'body\'        => $body,
      \'headers\'     => [
          \'Content-Type\' => \'application/json\',
      ],
      \'timeout\'     => 60,
      \'redirection\' => 5,
      \'blocking\'    => true,
      \'httpversion\' => \'1.0\',
      \'sslverify\'   => false,
      \'data_format\' => \'body\',
  ];

  wp_remote_post( $endpoint, $options );
}