前言

wordpress启用Redis Object Cache这个插件后会在我们页脚自动添加如下图的推广信息，本文的目的就是删除它

正式开始

首先我们进入wp的后台-插件-插件编辑器

右上方选择Redis Object Cache插件

选择includes下的class-plugin.php进行修改

大约在910-936行的位置，找到这一段话，删除它

        $message = sprintf(
            'Performance optimized by Redis Object Cache. Learn more: %s',
            'https://wprediscache.com'
        );

        if ( ! WP_DEBUG_DISPLAY ) {
            // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
            printf( "\n<!-- %s -->\n", $message );

            return;
        }

        $bytes = strlen( serialize( $wp_object_cache->cache ) ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.serialize_serialize

        $debug = sprintf(
            // translators: %1$d = number of objects. %2$s = human-readable size of cache. %3$s = name of the used client.
            __( 'Retrieved %1$d objects (%2$s) from Redis using %3$s.', 'redis-cache' ),
            $wp_object_cache->cache_hits,
            function_exists( 'size_format' ) ? size_format( $bytes ) : "{$bytes} bytes",
            $wp_object_cache->diagnostics['client']
        );

        printf(
            "<!--\n%s\n\n%s\n-->\n",
            $message, // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
            esc_html( $debug )
        );

然后再次查看页面源代码，会发现已经成功去除了