When I'm Trying to upgrade my magento module i'm getting Declaration of Zend\Mvc\Controller\PluginManager Fatal_error
PHP Fatal error: Declaration of Zend\Mvc\Controller\PluginManager::get($name, ?array $options = NULL) must be compatible with Zend\ServiceManager\AbstractPluginManager::get($name, $options = Array, $usePeeringServiceManagers = true) in /var/www/html/Magento/vendor/zendframework/zend-mvc/src/Controller/PluginManager.php on line 211
Help Me to resolve this
Generally this error occurs when your PHP Version is Not Supported and Not Compatible with your magento 2 setup.
if you are on linux then run php -v from command line and check which version of php are you using and check that version is supported by magento setup.
Refer this link for supported version of php by magento 2.2 - http://devdocs.magento.com/guides/v2.2/install-gde/system-requirements-tech.html
Also to know more details about the issue refer this link - https://community.magento.com/t5/Installing-Magento-2/Fatal-Error-Installing-on-XXamp/m-p/83571#M3441
