get_plugins()
Function: Checks the plugins directory and retrieve all plugin files with plugin data.
Source: wp-admin/includes/plugin.php:274
get_mu_plugins()
Function: Checks the mu-plugins directory and retrieve all mu-plugin files with any plugin data.
Source: wp-admin/includes/plugin.php:362
plugin_sandbox_scrape()
Function: Loads a given plugin attempt to generate errors.
Source: wp-admin/includes/plugin.php:2308