Coding Standards: Use strict comparison in get_active_blog_for_user().

Follow-up to [https://mu.trac.wordpress.org/changeset/804 mu:804], [https://mu.trac.wordpress.org/changeset/1918 mu:1918].

Props debarghyabanerjee, aristath, poena, afercia, SergeyBiryukov.
See #62279, #62283.

git-svn-id: https://develop.svn.wordpress.org/trunk@59562 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/ms-functions.php

@@ -71,18 +71,23 @@ function get_active_blog_for_user( $user_id ) {
 		}
 	}
 
-	if ( ( ! is_object( $primary ) ) || ( 1 == $primary->archived || 1 == $primary->spam || 1 == $primary->deleted ) ) {
+	if ( ( ! is_object( $primary ) )
+		|| ( '1' === $primary->archived || '1' === $primary->spam || '1' === $primary->deleted )
+	) {
 		$blogs = get_blogs_of_user( $user_id, true ); // If a user's primary blog is shut down, check their other blogs.
 		$ret   = false;
 		if ( is_array( $blogs ) && count( $blogs ) > 0 ) {
 			foreach ( (array) $blogs as $blog_id => $blog ) {
-				if ( get_current_network_id() != $blog->site_id ) {
+				if ( get_current_network_id() !== $blog->site_id ) {
 					continue;
 				}
+
 				$details = get_site( $blog_id );
-				if ( is_object( $details ) && 0 == $details->archived && 0 == $details->spam && 0 == $details->deleted ) {
+				if ( is_object( $details )
+					&& '0' === $details->archived && '0' === $details->spam && '0' === $details->deleted
+				) {
 					$ret = $details;
-					if ( get_user_meta( $user_id, 'primary_blog', true ) != $blog_id ) {
+					if ( (int) get_user_meta( $user_id, 'primary_blog', true ) !== $blog_id ) {
 						update_user_meta( $user_id, 'primary_blog', $blog_id );
 					}
 					if ( ! get_user_meta( $user_id, 'source_domain', true ) ) {