Fix issues reported by phpstan.

.travis.yml

@@ -22,6 +22,9 @@ matrix:
     - php: 7.3
       env: PHPCS=1 DEFAULT=0
 
+    - php: 7.3
+      env: STATIC_ANALYSIS=1 DEFAULT=0
+
     - php: 5.6
       env: PREFER_LOWEST=1
 
@@ -34,6 +37,8 @@ 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 [[ $STATIC_ANALYSIS = 1 ]]; then composer require --dev phpstan/phpstan-shim:^0.11; fi
+
 script:
   - |
       if [[ $DEFAULT = 1 && $TRAVIS_PHP_VERSION = 7.3 ]]; then
@@ -45,6 +50,8 @@ script:
 
   - if [[ $PHPCS = 1 ]]; then vendor/bin/phpcs -n -p --extensions=php --standard=vendor/cakephp/cakephp-codesniffer/CakePHP ./src ./tests; fi
 
+  - if [[ $STATIC_ANALYSIS = 1 ]]; then vendor/bin/phpstan.phar analyse src/; fi
+
 after_success:
   - |
       if [[ $DEFAULT = 1 && $TRAVIS_PHP_VERSION = 7.3 ]]; then

phpstan.neon

@@ -0,0 +1,5 @@
+parameters:
+    level: 5
+    ignoreErrors:
+        - '#Constant ROOT not found#'
+        - '#Parameter \#2 \$options of static method Cake\\Utility\\Text::slug\(\) expects array, string given#'

src/Model/Behavior/UploadBehavior.php

@@ -123,7 +123,7 @@ public function beforeSave(Event $event, Entity $entity, ArrayObject $options)
      * @param \Cake\Event\Event $event The afterDelete event that was fired
      * @param \Cake\ORM\Entity $entity The entity that was deleted
      * @param \ArrayObject $options the options passed to the delete method
-     * @return void|false
+     * @return bool
      */
     public function afterDelete(Event $event, Entity $entity, ArrayObject $options)
     {
@@ -167,7 +167,7 @@ public function afterDelete(Event $event, Entity $entity, ArrayObject $options)
      * @param array $data the data being submitted for a save
      * @param string $field the field for which data will be saved
      * @param array $settings the settings for the current field
-     * @return \Josegonzalez\Upload\File\Path\AbstractProcessor
+     * @return \Josegonzalez\Upload\File\Path\ProcessorInterface
      */
     public function getPathProcessor(Entity $entity, $data, $field, $settings)
     {
@@ -190,7 +190,7 @@ public function getPathProcessor(Entity $entity, $data, $field, $settings)
      * @param array $data the data being submitted for a save
      * @param string $field the field for which data will be saved
      * @param array $settings the settings for the current field
-     * @return \Josegonzalez\Upload\File\Path\AbstractProcessor
+     * @return \Josegonzalez\Upload\File\Writer\WriterInterface
      */
     public function getWriter(Entity $entity, $data, $field, $settings)
     {