Fix deprecation warnings

.travis.yml

@@ -6,6 +6,10 @@ php:
   - 7.1
   - 7.2
 
+services:
+  - mysql
+  - postgresql
+
 env:
   matrix:
     - DB=mysql db_dsn='mysql://root@127.0.0.1/cakephp_test'
@@ -37,7 +41,7 @@ before_script:
   - if [[ $DB = 'mysql' ]]; then mysql -e 'CREATE DATABASE cakephp_test;'; fi
   - if [[ $DB = 'pgsql' ]]; then psql -c 'CREATE DATABASE cakephp_test;' -U postgres; fi
 
-  - if [[ $PHPCS = 1 ]]; then composer require cakephp/cakephp-codesniffer; fi
+  - if [[ $PHPCS = 1 ]]; then composer require cakephp/cakephp-codesniffer:^3.0; fi
   - if [[ $PHPSTAN = 1 ]]; then composer require phpstan/phpstan; fi
 
 script:

src/Model/Entity/TagAwareTrait.php

@@ -57,7 +57,8 @@ public function untag($tags = null)
 
         foreach ($untags as $untag) {
             foreach ($tags as $k => $tag) {
-                if ((empty($untag[$pk]) || $tag[$pk] === $untag[$pk]) &&
+                if (
+                    (empty($untag[$pk]) || $tag[$pk] === $untag[$pk]) &&
                     (empty($untag[$df]) || $tag[$df] === $untag[$df])
                 ) {
                     unset($tags[$k]);

src/Model/Table/TagsTable.php

@@ -18,7 +18,11 @@ public function initialize(array $config)
         $this->setTable('tags_tags');
         $this->setDisplayField('label');
         $this->addBehavior('Timestamp');
-        if (Plugin::loaded('Muffin/Slug')) {
+        $method = 'isLoaded';
+        if (!method_exists(Plugin::class, 'isLoaded')) {
+            $method = 'loaded';
+        }
+        if (Plugin::{$method}('Muffin/Slug')) {
             $this->addBehavior('Muffin/Slug.Slug');
         }
     }

tests/bootstrap.php

@@ -30,5 +30,3 @@
 }
 
 require $root . '/vendor/cakephp/cakephp/tests/bootstrap.php';
-
-\Cake\Core\Plugin::load('Muffin/Tags', ['path' => dirname(dirname(__FILE__)) . DS]);