如何定制wordpress注册表？

function custom_register_form() {
    // 添加自定义字段
    ?>
    <p>
        <label for="custom_field">自定义字段：</label>
        <input type="text" name="custom_field" id="custom_field" class="input" value="<?php echo ( isset( $_POST['custom_field'] ) ? $_POST['custom_field'] : '' ); ?>" />
    </p>
    <?php
}
add_action( 'register_form', 'custom_register_form' );

function custom_register_form_validation( $errors, $sanitized_user_login, $user_email ) {
    // 验证自定义字段
    if ( empty( $_POST['custom_field'] ) ) {
        $errors->add( 'custom_field_error', __( '<strong>错误</strong>: 请填写自定义字段。' ) );
    }
    return $errors;
}
add_filter( 'registration_errors', 'custom_register_form_validation', 10, 3 );

function custom_register_user( $user_id ) {
    // 保存自定义字段的值
    if ( ! empty( $_POST['custom_field'] ) ) {
        update_user_meta( $user_id, 'custom_field', sanitize_text_field( $_POST['custom_field'] ) );
    }
}
add_action( 'user_register', 'custom_register_user' );