diff --git a/.travis.yml b/.travis.yml
index d814ff93b..81cd29536 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,12 @@ language: php
 env:
     global:
         - XDEBUG_MODE=coverage
+        
+services:
+  - mysql
+  - postgresql
+
+
 matrix:
  include:
   - php: 5.3
@@ -23,6 +29,8 @@ matrix:
     dist: trusty
   - php: 7.4
     dist: trusty
+  - php: 8.0
+    dist: xenial
 
 
 before_script:
diff --git a/RedBeanPHP/DuplicationManager.php b/RedBeanPHP/DuplicationManager.php
index b5bb93b99..290fdd20e 100644
--- a/RedBeanPHP/DuplicationManager.php
+++ b/RedBeanPHP/DuplicationManager.php
@@ -274,7 +274,7 @@ public function __construct( ToolBox $toolbox )
 	public function camelfy( $array, $dolphinMode = FALSE ) {
 		$newArray = array();
 		foreach( $array as $key => $element ) {
-			$newKey = preg_replace_callback( '/_(\w)/', function( &$matches ){
+			$newKey = preg_replace_callback( '/_(\w)/', function( $matches ){
 				return strtoupper( $matches[1] );
 			}, $key);
 
diff --git a/testing/RedUNIT/Base/Finding.php b/testing/RedUNIT/Base/Finding.php
index 52bbc5909..4c0d9cb89 100644
--- a/testing/RedUNIT/Base/Finding.php
+++ b/testing/RedUNIT/Base/Finding.php
@@ -257,7 +257,7 @@ public function testPreloadingOwnListWithMulti()
 			asrt(count($book->noLoad()->ownPageList),2);
 			asrt($book->title,"book{$i}");
 			$pages = $book->noLoad()->ownPageList;
-			usort($pages, function($a,$b){ return $a->title > $b->title; });
+			usort($pages, function($a,$b){ return strcmp( $a->title, $b->title ); });
 			$first = reset($pages);
 			asrt( $first->title, "1/$i" );
 			$last = end($pages);
diff --git a/testing/RedUNIT/Base/Misc.php b/testing/RedUNIT/Base/Misc.php
index 22d2f9b3f..4ac9b634e 100644
--- a/testing/RedUNIT/Base/Misc.php
+++ b/testing/RedUNIT/Base/Misc.php
@@ -271,7 +271,7 @@ public function testBeautifulColumnNames()
 		asrt( ( $town->name == 'BeautyVille' ), TRUE );
 		testpack( 'Accept datetime objects.' );
 		$cal = R::dispense( 'calendar' );
-		$cal->when = new\DateTime( '2000-01-01', new\DateTimeZone( 'Pacific/Nauru' ) );
+		$cal->when = new \DateTime( '2000-01-01', new \DateTimeZone( 'Pacific/Nauru' ) );
 		asrt( $cal->when, '2000-01-01 00:00:00' );
 		testpack( 'Affected rows test' );
 		$currentDriver = $this->currentlyActiveDriverID;
diff --git a/testing/RedUNIT/Base/Typechecking.php b/testing/RedUNIT/Base/Typechecking.php
index 04b25c033..970239925 100644
--- a/testing/RedUNIT/Base/Typechecking.php
+++ b/testing/RedUNIT/Base/Typechecking.php
@@ -63,7 +63,7 @@ public function testTypes()
 		$bean->bool2    = TRUE;
 		$bean->text     = 'abc';
 		$bean->null     = null;
-		$bean->datetime = new\DateTime( 'NOW', new\DateTimeZone( 'Europe/Amsterdam' ) );
+		$bean->datetime = new \DateTime( 'NOW', new \DateTimeZone( 'Europe/Amsterdam' ) );
 		$id = R::store( $bean );
 		asrt( is_int( $id ), TRUE );
 		asrt( is_float( $bean->float ), TRUE );
diff --git a/testing/RedUNIT/Blackhole/Misc.php b/testing/RedUNIT/Blackhole/Misc.php
index 108e9e2f4..9c6eb5759 100644
--- a/testing/RedUNIT/Blackhole/Misc.php
+++ b/testing/RedUNIT/Blackhole/Misc.php
@@ -363,7 +363,7 @@ public function testTransactionInFacade()
 			R::transaction( function () use ( $bean ) {
 				R::store( $bean );
 				R::transaction( function () {
-					throw new\Exception();
+					throw new \Exception();
 				} );
 			} );
 		} catch (\Exception $e ) {
@@ -376,7 +376,7 @@ public function testTransactionInFacade()
 			R::transaction( function () use ( $bean ) {
 				R::transaction( function () use ( $bean ) {
 					R::store( $bean );
-					throw new\Exception();
+					throw new \Exception();
 				} );
 			} );
 		} catch (\Exception $e ) {