wordpress用户名允许使用邮箱登陆方法

function email_address_login($username) {
$user = get_user_by_email($username);
if(!empty($user->user_login))
$username = $user->user_login;
return $username;
}
add_action('wp_authenticate','email_address_login');

 把它修改成

// 修改WordPress用户名过滤机制，通过Email获取用户名
function ludou_allow_email_login($username, $raw_username, $strict) {
  if (filter_var($raw_username, FILTER_VALIDATE_EMAIL)) {
    $user_data = get_user_by('email', $raw_username);

    if (empty($user_data))
      wp_die(__('ERROR: There is no user registered with that email address.'), '用户名不正确');
    else
      return $user_data->user_login;
  }
  else {
    return $username;
  }
}
// 修改登录界面的文字，"用户名"改成"用户名或邮箱"
function ludou_change_text() {
  echo '';
}
if (in_array($GLOBALS['pagenow'], array('wp-login.php')) && strpos($_SERVER['REQUEST_URI'], '?action=register') === FALSE && strpos($_SERVER['REQUEST_URI'], '?action=lostpassword') === FALSE && strpos($_SERVER['REQUEST_URI'], '?action=rp') === FALSE ) {
  add_filter('sanitize_user', 'ludou_allow_email_login', 10, 3);
  add_action('login_footer', 'ludou_change_text');
}

//让WordPress支持用户名或邮箱登录
function dr_email_login_authenticate( $user, $username, $password ) {
 if ( is_a( $user, 'WP_User' ) )
  return $user;
 
 if ( !empty( $username ) ) {
  $username = str_replace( '&', '&', stripslashes( $username ) );
  $user = get_user_by( 'email', $username );
  if ( isset( $user, $user->user_login, $user->user_status ) && 0 == (int) $user->user_status )
   $username = $user->user_login;
 }
 
 return wp_authenticate_username_password( null, $username, $password );
}
remove_filter( 'authenticate', 'wp_authenticate_username_password', 20, 3 );
add_filter( 'authenticate', 'dr_email_login_authenticate', 20, 3 );
 
//替换“用户名”为“用户名 / 邮箱”
function username_or_email_login() {
 if ( 'wp-login.php' != basename( $_SERVER['SCRIPT_NAME'] ) )
  return;
 
 ?> }
add_action( 'login_form', 'username_or_email_login' );