The wp-config.php is the WordPress configuration file. It sets global variables for a WordPress site and contains your WordPress database information. This is the first file WordPress loads for obvious reasons. Learn more 关于 wp-config.php 文件以及如何编辑它.
If advanced-cache.php file exists on your site, then WordPress will load it next. This file acts as a drop-in file and is used by several 流行插件 particularly WordPress caching plugins. If your site is using this file, then you will see a new item on the plugins screen called Drop-ins.
The functions.php file acts as plugin and is used in WordPress themes to add theme specific features to your website. If you are using a 儿童主题, then WordPress will now load your child theme’s 函数.php file.