With php 5.5 app engine standard, errors showed in Stackdriver with the request meta data (see screenshot):

With php 7 standard, no meta data:

How can I link the request meta data to the error with app engine php 7 standard?
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You should have the data that you need in the Stackdriver Logging. As it is stated in the documentation :
You just need to go to Stackdriver Logging and match the error that was reported. Than click on
expandand you will see all the data associated to the problematic request.You can also configure the views for the logs, in order to make them more, or less detailes, or to define their priorities. Moreover, you can write your own logs with all the data that you want to include within them :