diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index b956479e45..3160a31025 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -4275,23 +4275,19 @@ function wp_suspend_cache_invalidation( $suspend = true ) {
  *
  * @since 3.0.0
  *
- * @global object $current_site
- *
  * @param int $site_id Optional. Site ID to test. Defaults to current site.
  * @return bool True if $site_id is the main site of the network, or if not
  *              running Multisite.
  */
 function is_main_site( $site_id = null ) {
-	// This is the current network's information; 'site' is old terminology.
-	global $current_site;
-
-	if ( ! is_multisite() )
+	if ( ! is_multisite() ) {
 		return true;
+	}
 
-	if ( ! $site_id )
+	if ( ! $site_id ) {
 		$site_id = get_current_blog_id();
-
-	return (int) $site_id === (int) $current_site->blog_id;
+	}
+	return (int) $site_id === (int) get_current_site()->blog_id;
 }
 
 /**
diff --git a/src/wp-includes/link-template.php b/src/wp-includes/link-template.php
index 274d4506a8..fb5bfb9e58 100644
--- a/src/wp-includes/link-template.php
+++ b/src/wp-includes/link-template.php
@@ -3263,13 +3263,15 @@ function network_site_url( $path = '', $scheme = null ) {
 
 	$current_site = get_current_site();
 
-	if ( 'relative' == $scheme )
+	if ( 'relative' == $scheme ) {
 		$url = $current_site->path;
-	else
+	} else {
 		$url = set_url_scheme( 'http://' . $current_site->domain . $current_site->path, $scheme );
+	}
 
-	if ( $path && is_string( $path ) )
+	if ( $path && is_string( $path ) ) {
 		$url .= ltrim( $path, '/' );
+	}
 
 	/**
 	 * Filters the network site URL.
@@ -3309,13 +3311,15 @@ function network_home_url( $path = '', $scheme = null ) {
 	if ( ! in_array( $scheme, array( 'http', 'https', 'relative' ) ) )
 		$scheme = is_ssl() && ! is_admin() ? 'https' : 'http';
 
-	if ( 'relative' == $scheme )
+	if ( 'relative' == $scheme ) {
 		$url = $current_site->path;
-	else
+	} else {
 		$url = set_url_scheme( 'http://' . $current_site->domain . $current_site->path, $scheme );
+	}
 
-	if ( $path && is_string( $path ) )
+	if ( $path && is_string( $path ) ) {
 		$url .= ltrim( $path, '/' );
+	}
 
 	/**
 	 * Filters the network home URL.
diff --git a/src/wp-includes/load.php b/src/wp-includes/load.php
index f6ae4b4c9f..cd667734b4 100644
--- a/src/wp-includes/load.php
+++ b/src/wp-includes/load.php
@@ -1059,3 +1059,22 @@ function wp_doing_ajax() {
 function is_wp_error( $thing ) {
 	return ( $thing instanceof WP_Error );
 }
+
+/**
+ * Get the current network.
+ *
+ * Returns an object containing the 'id', 'domain', 'path', and 'site_name'
+ * properties of the network being viewed.
+ *
+ * @see wpmu_current_site()
+ *
+ * @since MU
+ *
+ * @global WP_Network $current_site
+ *
+ * @return WP_Network
+ */
+function get_current_site() {
+	global $current_site;
+	return $current_site;
+}
\ No newline at end of file
diff --git a/src/wp-includes/ms-blogs.php b/src/wp-includes/ms-blogs.php
index ccafd04768..2a1549f98c 100644
--- a/src/wp-includes/ms-blogs.php
+++ b/src/wp-includes/ms-blogs.php
@@ -1083,13 +1083,11 @@ function get_networks( $args = array() ) {
  *
  * @since 4.6.0
  *
- * @global WP_Network $current_site
- *
  * @param WP_Network|int|null $network Optional. Network to retrieve. Default is the current network.
  * @return WP_Network|null The network object or null if not found.
  */
 function get_network( $network = null ) {
-	global $current_site;
+	$current_site = get_current_site();
 	if ( empty( $network ) && isset( $current_site ) ) {
 		$network = $current_site;
 	}
diff --git a/src/wp-includes/ms-functions.php b/src/wp-includes/ms-functions.php
index a253a61dac..d133324db0 100644
--- a/src/wp-includes/ms-functions.php
+++ b/src/wp-includes/ms-functions.php
@@ -1332,8 +1332,7 @@ function insert_blog($domain, $path, $site_id) {
  * @param string $blog_title The title of the new site.
  */
 function install_blog( $blog_id, $blog_title = '' ) {
-	global $wpdb, $wp_roles, $current_site;
-
+	global $wpdb, $wp_roles;
 	// Cast for security
 	$blog_id = (int) $blog_id;
 
@@ -1361,7 +1360,7 @@ function install_blog( $blog_id, $blog_title = '' ) {
  		if ( 'https' === parse_url( get_site_option( 'siteurl' ), PHP_URL_SCHEME ) ) {
  			$siteurl = set_url_scheme( $siteurl, 'https' );
  		}
- 		if ( 'https' === parse_url( get_home_url( $current_site->blog_id ), PHP_URL_SCHEME ) ) {
+ 		if ( 'https' === parse_url( get_home_url( get_current_site()->blog_id ), PHP_URL_SCHEME ) ) {
  			$home = set_url_scheme( $home, 'https' );
  		}
 
@@ -1498,8 +1497,9 @@ We hope you enjoy your new site. Thanks!
 	$message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n";
 	$message = $welcome_email;
 
-	if ( empty( $current_site->site_name ) )
+	if ( empty( $current_site->site_name ) ) {
 		$current_site->site_name = 'WordPress';
+	}
 
 	/**
 	 * Filters the subject of the welcome email after site activation.
@@ -1591,25 +1591,6 @@ function wpmu_welcome_user_notification( $user_id, $password, $meta = array() )
 	return true;
 }
 
-/**
- * Get the current network.
- *
- * Returns an object containing the 'id', 'domain', 'path', and 'site_name'
- * properties of the network being viewed.
- *
- * @see wpmu_current_site()
- *
- * @since MU
- *
- * @global WP_Network $current_site
- *
- * @return WP_Network
- */
-function get_current_site() {
-	global $current_site;
-	return $current_site;
-}
-
 /**
  * Get a user's most recent post.
  *
diff --git a/src/wp-includes/option.php b/src/wp-includes/option.php
index 2293b0154f..ff373cbf04 100644
--- a/src/wp-includes/option.php
+++ b/src/wp-includes/option.php
@@ -1070,7 +1070,6 @@ function update_site_option( $option, $value ) {
  * @see get_option()
  *
  * @global wpdb   $wpdb
- * @global object $current_site
  *
  * @param int      $network_id ID of the network. Can be null to default to the current network ID.
  * @param string   $option     Name of option to retrieve. Expected to not be SQL-escaped.
@@ -1078,7 +1077,7 @@ function update_site_option( $option, $value ) {
  * @return mixed Value set for the option.
  */
 function get_network_option( $network_id, $option, $default = false ) {
-	global $wpdb, $current_site;
+	global $wpdb;
 
 	if ( $network_id && ! is_numeric( $network_id ) ) {
 		return false;
@@ -1088,7 +1087,7 @@ function get_network_option( $network_id, $option, $default = false ) {
 
 	// Fallback to the current network if a network ID is not specified.
 	if ( ! $network_id && is_multisite() ) {
-		$network_id = $current_site->id;
+		$network_id = get_current_site()->id;
 	}
 
 	/**
@@ -1187,7 +1186,6 @@ function get_network_option( $network_id, $option, $default = false ) {
  * @see add_option()
  *
  * @global wpdb   $wpdb
- * @global object $current_site
  *
  * @param int    $network_id ID of the network. Can be null to default to the current network ID.
  * @param string $option     Name of option to add. Expected to not be SQL-escaped.
@@ -1195,7 +1193,7 @@ function get_network_option( $network_id, $option, $default = false ) {
  * @return bool False if option was not added and true if option was added.
  */
 function add_network_option( $network_id, $option, $value ) {
-	global $wpdb, $current_site;
+	global $wpdb;
 
 	if ( $network_id && ! is_numeric( $network_id ) ) {
 		return false;
@@ -1205,7 +1203,7 @@ function add_network_option( $network_id, $option, $value ) {
 
 	// Fallback to the current network if a network ID is not specified.
 	if ( ! $network_id && is_multisite() ) {
-		$network_id = $current_site->id;
+		$network_id = get_current_site()->id;
 	}
 
 	wp_protect_special_option( $option );
@@ -1297,14 +1295,13 @@ function add_network_option( $network_id, $option, $value ) {
  * @see delete_option()
  *
  * @global wpdb   $wpdb
- * @global object $current_site
  *
  * @param int    $network_id ID of the network. Can be null to default to the current network ID.
  * @param string $option     Name of option to remove. Expected to not be SQL-escaped.
  * @return bool True, if succeed. False, if failure.
  */
 function delete_network_option( $network_id, $option ) {
-	global $wpdb, $current_site;
+	global $wpdb;
 
 	if ( $network_id && ! is_numeric( $network_id ) ) {
 		return false;
@@ -1314,7 +1311,7 @@ function delete_network_option( $network_id, $option ) {
 
 	// Fallback to the current network if a network ID is not specified.
 	if ( ! $network_id && is_multisite() ) {
-		$network_id = $current_site->id;
+		$network_id = get_current_site()->id;
 	}
 
 	/**
@@ -1379,7 +1376,6 @@ function delete_network_option( $network_id, $option ) {
  * @see update_option()
  *
  * @global wpdb   $wpdb
- * @global object $current_site
  *
  * @param int      $network_id ID of the network. Can be null to default to the current network ID.
  * @param string   $option     Name of option. Expected to not be SQL-escaped.
@@ -1387,7 +1383,7 @@ function delete_network_option( $network_id, $option ) {
  * @return bool False if value was not updated and true if value was updated.
  */
 function update_network_option( $network_id, $option, $value ) {
-	global $wpdb, $current_site;
+	global $wpdb;
 
 	if ( $network_id && ! is_numeric( $network_id ) ) {
 		return false;
@@ -1397,7 +1393,7 @@ function update_network_option( $network_id, $option, $value ) {
 
 	// Fallback to the current network if a network ID is not specified.
 	if ( ! $network_id && is_multisite() ) {
-		$network_id = $current_site->id;
+		$network_id = get_current_site()->id;
 	}
 
 	wp_protect_special_option( $option );