Update Collection.php

Minor DocBlock correction
add support number of string in __construct of Priority
remove twice registered "zendframework/zend-session" in composer.json
Merge pull request #6163
Merge pull request #6163 in master
Merge pull request #6159
Merge pull request #6159 in master
Merge pull request #6149
Merge pull request #6149 in master
Fix: Add missing throws tags
Fix: Fix PHP-CS-Fixer to a working version
Merge pull request #6180
Merge pull request #6180 in master
Merge pull request #6164
Merge pull request #6164 in master
Fix: Indentation when throwing exception
Fix: Remove extra empty lines
Fix: Add trailing commas in array initializations
Fix: Indentation of array initialization
Fix: Add missing trailing comma