如何检查通过联系表 7 提交的电子邮件是否存在于我的数据库中？

Question

当客户通过联系表格 7 提交电子邮件时，我如何检查电子邮件是否已存在于我的数据库中并将通知消息更改为“您的电子邮件已存在于我们的数据库中”

到目前为止，我已经尝试使用 before_send 钩子，但是当我单击提交时，页面只是挂起并且没有确认消息。

下面是我的functions.php中的功能

add_action( 'wpcf7_before_send_mail', 'check_email' );

function check_email( $cf7 )
{
$email = $cf7->posted_data["email"];
if($email == 'Is in our database'){
echo ('Your email exists in our database');
}
}

谢谢你的帮助

Answer 1

我在验证上添加了一个过滤器：

add_filter( 'wpcf7_validate', 'email_already_in_db', 10, 2 );

function email_already_in_db ( $result, $tags ) {
    // retrieve the posted email
    $form  = WPCF7_Submission::get_instance();
    $email = $form->get_posted_data('your-email');
    // if already in database, invalidate
    if( email_exists( $email ) ) // email_exists is a WP function
        $result->invalidate('your-email', 'Your email exists in our database');
    // return the filtered value
    return $result;
}

在这种情况下，电子邮件字段名为your-email。

该函数email_exists是用于处理此问题的本机 WP 函数。

Answer 2

这是一个适用于我的解决方案，使用插件Advanced Contact form 7 DB

function email_already_in_db ( $result, $tags ) {
    // Retrieve the posted form
    $form  = WPCF7_Submission::get_instance();
    $form_posted_data = $form->get_posted_data();

    // Get the field name that we want to check for duplicates.
    // I added 'unique' to the beginning of the field name in CF7
    // Checking for that with preg_grep
    $unique_field_name = preg_grep("/unique(\w+)/", array_keys($form_posted_data));

    // $unique_field_name comes back as array so the next three lines give us the key as a string
    reset($unique_field_name);
    $first_key = key($unique_field_name);
    $unique_field_name = $unique_field_name[$first_key];

    // Check the form submission unique field vs what is already in the database
    $email = $form->get_posted_data($unique_field_name);
    global $wpdb;
    $entry = $wpdb->get_results( "SELECT * FROM wp_cf7_vdata_entry WHERE name LIKE '$unique_field_name' AND value='$email'" );

    // If already in database, invalidate
    if (!empty($entry)) {
      $result->invalidate($field_name, 'Your email: '.$email.' already exists in our database.');
      }
    // return the filtered value
  return $result;
}