I recently hit an issue updating Magento v.2.1.9 to 2.2.0 via composer. Magento 2.2.0 brought lots of bug fixes as well as a move to PHP 7.1.0 which reportedly gave a 30% speed increase.

The php version was updated to 7.1 via the Control Panel, but I was still getting an error preventing me from starting the upgrade,

I read that this might be a cron issue, but manually running the Magento cron scripts didn’t fix the issue.

 

Error
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php composer.phar update

Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

Problem 1
– Installation request for magento/product-community-edition 2.2.0 -> satisfiable by magento/product-community-edition[2.2.0].
– magento/product-community-edition 2.2.0 requires php 7.0.2|7.0.4|~7.0.6|~7.1.0 -> your PHP version (5.6.31) does not satisfy that requirement.

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The front end would also break as Magento 2.1.9 doesn’t work for php7.1.0 (although the site was not yet live).

 

Solution – your PHP version (5.6.31) does not satisfy that requirement

As the server supported multiple PHP versions, I needed to change my SSH commands to run the script in PHP7.1.0.

 

I was executing the update script using PHP 5.6.

php composer.phar update

 

Run the update script in Composer using PHP 7

In order to run the update script in Composer using PHP 7, I needed the following command instead:

php7.cli composer.phar update

 

All my commands run via Composer in SSH, now would need php7.cli.

php7.cli bin/magento setup:upgrade

php7.cli -dmemory_limit=6G bin/magento deploy:mode:set production -s

php7.cli -dmemory_limit=6G bin/magento setup:di:compilephp7.cli bin/magento setup:static-content:deploy en_US en_GB

php7.cli bin/magento indexer:reindex

php7.cli bin/magento cache:clean

php7.cli bin/magento cache:enable

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