Toggle `$_wp_using_ext_object_cache` on and off without directly touching global.
require_wp_db
Load the database class file and instantiate the `$wpdb` global.
enable_wp_debug_mode_checks
Filters whether to allow the debug mode check to occur.
wp_set_lang_dir
Set the location of the language directory.
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wp_debug_mode
Set PHP error reporting based on WordPress debug settings.
timer_stop
Retrieve or display the time from the page start to when function is called.
timer_start
Start the WordPress micro-timer.
enable_maintenance_mode
Filters whether to enable maintenance mode.
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wp_maintenance
Die with a maintenance message when conditions are met.
wp_favicon_request
Don’t load all of WordPress when handling a favicon.ico request.
wp_check_php_mysql_versions
Check for the required PHP version, and the MySQL extension or a database drop-in.
wp_fix_server_vars
Fix `$_SERVER` variables for various setups.
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wp_unregister_GLOBALS
Turn register globals off.
wp_get_server_protocol
Return the HTTP protocol sent by the server.