WordPress提供_x() 函数，就像__(), 但它增加了$context 用于区分相同字符串的参数。

在下面的示例中，在页脚中生成了一些输出。可翻译字符串为Message 在这两种情况下都使用，但在第一种情况下，Message 给出了上下文for use in footer text.

接下来，我们使用gettext_with_context 和gettext 分别筛选以独立地翻译每个字符串。

// Generate output for our example.
add_action( \'wp_footer\', \'wpse_example_strings\' );
function wpse_example_strings() {
    // Note that concatenating strings is not translation friendly. It\'s done here for simplicity.
    echo \'Message string with context: \' . _x( \'Message\', \'for use in footer text\', \'text_domain\' ) . \'<br>\';
    echo \'Message string without context: \' . __( \'Message\', \'text_domain\' ) . \'<br>\';
}

/**
 * Translate text with context.
 *
 * https://codex.wordpress.org/Plugin_API/Filter_Reference/gettext_with_context
 *
 * @param string $translation  Translated text.
 * @param string $text         Text to translate.
 * @param string $context      Context information for the translators.
 * @param string $domain       Text domain. Unique identifier for retrieving translated strings.
 *
 * @return string
 */
add_filter( \'gettext_with_context\', \'wpse_gettext_with_context\', 10, 4 );
function wpse_gettext_with_context( $translation, $text, $context, $domain ) {
    if ( \'text_domain\' === $domain ) {
        if ( \'Message\' === $text && \'for use in footer text\' === $context ) {
            $translation = \'Message Us\';
        }
    }

    return $translation;
}

/**
 * Translate text without context.
 *
 * @param string $translation  Translated text.
 * @param string $text         Text to translate.
 * @param string $domain       Text domain. Unique identifier for retrieving translated strings.
 *
 * @return string
 */
add_filter( \'gettext\', \'um_rename_messagetxt\', 10, 3);
function um_rename_messagetxt( $translation, $text, $domain ) {
    if ( \'text_domain\' === $domain ) {
        if ( \'Message\' === $text ) {
            $translation = \'Contact Us\';
        }
    }

    return $translation;
}

这里有一个解决方案，它将用我们自己的分叉版本替换默认的最终成员消息按钮的短代码。请注意，我们可以回收ultimatemember_message_button 名称我建议用这段代码制作一个插件：

<?php
/*
Plugin Name: Ulimate Member Custom Message Button Shortcode
Plugin URI: 
Description: 
Version: 0.0.1
Author:
Author URI:
License: GPL2/Creative Commons
*/

/**
 * Remove the default UM Message shortcode and wire up our forked version.
 */ 
add_action( \'init\', \'wpse_ultimatemember_message_button_custom\' );
function wpse_ultimatemember_message_button_custom() {
    global $um_messaging;
    remove_shortcode( \'ultimatemember_message_button\', [ $um_messaging->shortcode, \'ultimatemember_message_button\' ] );
    add_shortcode( \'ultimatemember_message_button\', \'wpse_ultimatemember_message_button\' );
}

/**
 * Customized version of ultimatemember_message_button shortcode, which allows
 * for the button\'s label to be specified using the \'label\' parameter.
 */
function wpse_ultimatemember_message_button( $args = array() ) {
    global $ultimatemember, $um_messaging;

        $defaults = array(
            \'user_id\' => 0,
            \'label\' => __( \'Message\',\'um-messaging\' ),
        );
    $args = wp_parse_args( $args, $defaults );
    extract( $args );

    $current_url = $ultimatemember->permalinks->get_current_url();

    if( um_get_core_page(\'user\') ){
        do_action("um_messaging_button_in_profile", $current_url, $user_id );
    }

    if ( !is_user_logged_in() ) {
        $redirect = um_get_core_page(\'login\');
        $redirect = add_query_arg(\'redirect_to\', $current_url, $redirect );
        $btn = \'<a href="\' . $redirect . \'" class="um-login-to-msg-btn um-message-btn um-button" data-message_to="\'.$user_id.\'">\'. $label .\'</a>\';
        return $btn;
    } else if ( $user_id != get_current_user_id() ) {

        if ( $um_messaging->api->can_message( $user_id ) ) {
            $btn = \'<a href="#" class="um-message-btn um-button" data-message_to="\'.$user_id.\'"><span>\'. $label .\'</span></a>\';
            return $btn;
        }

    }

}

<div class="msgshort">
    <?php echo do_shortcode(\'[ultimatemember_message_button user_id=2 label="Contact US"]\'); ?>
</div>