Is there a specific reason why you require the need to perform writes to your 'public/app' folder? Scalable applications in the cloud should normally never perform writes to the local filesystem, as data written in an App Engine instance is released with the instance when it is no longer needed (e.g. when incoming traffic reduces and your App Engine instances scale down <https://cloud.google.com/appengine/docs/flexible/php/an-overview-of-app-engine#instance_scaling> ).
It is recommended you perform writes to a non-volatile/persistent location like Google Cloud Storage <https://cloud.google.com/storage/> or the Google Cloud Datastore <https://cloud.google.com/datastore/> that can be written/read by your application running in multiple App Engine instances. You can follow the Reading and Writing Files <https://cloud.google.com/appengine/docs/standard/php/googlestorage/> guide for PHP which explains how to use Google Cloud Storage as a wrapper for reading and writing files in an App Engine PHP app. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/cbe25784-7636-4b88-9386-e680877f6318%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
