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I've come to the realization PHP sucks! I've been a web host for 10 odd years. A Hobby PHP programmer for years! PHP is insecure hunk of junk. The error reporting has got worse over the years. Due to my physical limits i often make simple mistakes. Forget a ")" on line 12. PHP helpfully tells me the error is on line 24! PHP Error Line 41
class DomainController extends CustomerController implements DomainTableAwareInterface, MySQLAwareInterface, UserAwareInterface
PHP Error....
php -l application/module/Customer/src/Customer/Controller/DomainController.php
No syntax errors detected in application/module/Customer/src/Customer/Controller/DomainController.php
php -l application/module/Application/src/Application/Interfaces/UserAwareInterface.php 
No syntax errors detected in application/module/Application/src/Application/Interfaces/UserAwareInterface.php
Both Development and Production boxes are PHP 7.0.22 If I remove UserAwareInterface from the class implements line another error as the objects UserAwareInterface was injecting don't exist.