Refactor Code

- Fix failing tests
- Bump minimum PHP version to 5.6
- Add some CodeStyle

Author: PReimers

.travis.yml

@@ -1,20 +1,16 @@
 language: php
 
 php:
+  - 7.2
   - 7.1
   - 7.0
   - 5.6
-  - 5.5
-  - 5.4
-  - 5.3
   - hhvm
 
 matrix:
     fast_finish: true
     allow_failures:
-        - php: 5.5
-        - php: 5.4
-        - php: 5.3
+        - php: 5.6
         - php: hhvm
 
 before_script:

composer.json

@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "php": "^5.3 || ^7.0"
+        "php": "^5.6 || ^7.0"
     },
     "require-dev": {
         "phpunit/phpunit": "*",