Adding fields

首先，在注册公式中添加一些字段

add_action( \'register_form\', \'extended_register_form\', 10, 0 );

function extended_register_form() {

    // if an error occurs, we are here again and the
    // values that are entered in the formular are setup in the $_POST array
    $age = filter_input( INPUT_POST, \'age\', FILTER_SANITIZE_NUMBER_INT );

    echo \'<p>\';
    echo \'<label for="age">Your age:&&nbsp;</label>\';
    printf( \'<input type="text" id="age" name="age" size="2" value ="%s" />\', $age );
    echo \'</p>\';

    echo \'<p>\';
    echo \'<input type="checkbox" id="tos_check" name="tos_check" />\';
    echo \'<label for="tos_check">&nbsp;I agree to the terms of service</label>\';
    echo \'</p>\';

}

Verifying, validating & sanitazion

现在我们必须验证用户的输入。如果一个或多个值与我们的条件不匹配，我们希望抛出一条错误消息。要执行此操作，请钩住registration_errors 并将一个或多个错误添加到错误对象。如果错误对象不为空，将停止注册并打印错误。

add_filter( \'registration_errors\', \'show_errors\', 10, 3 );

function show_errors( $errors, $login, $email ) {

    $tos_check = ( isset( $_POST[\'tos_check\'] ) && true == $_POST[\'tos_check\'] ) ?
        true : false;

    if ( false == $tos_check )
        $errors->add( \'termsnotaccepted\', \'You have to agree to the TOS\' );

    $age_check = filter_input( INPUT_POST, \'age\', FILTER_SANITIZE_NUMBER_INT );

    if ( $age_check < 21 )
        $errors->add( \'toyoungerror\', \'Sorry, you are to young\' );

    return $errors;

}

Storing the data

最后，钩住用户注册例程，检查是否设置了（已验证和已验证）值。如果这些值存在，请将它们存储在users元中。

add_action( \'user_register\', \'user_register\', 10, 1 );

function user_register( $user_id ) {

    $data = array();

    $age = filter_input( INPUT_POST, \'age\', FILTER_SANITIZE_NUMBER_INT );

    if ( ! empty( $age ) )
      $data[\'age\'] = $age;

    update_user_meta( $user_id, \'choose-a-key\', $data );

    return $user_id;

}

Summary

<将您的字段添加到注册公式中，以验证、验证和清理这些值。如果未设置必需值（或无效），请添加错误。这将停止注册过程并打印错误消息将所需的值存储在用户元中