Many wfs_ files in /tmp

[laurentj]

What is the bug?

There are tons of files into /tmp/ with name starting with wfs_.

Expected behavior

No wfs_ files into tmp, or at least, only few.

The responsible is WFSRequest::getfeaturePostgres() which create such files.

A comment in the code of this methods says it creates the file to avoid memory issues, but later in the code of Lizmap, the content of this file is readed and then json_decode is applied, so i'm not sure the memory issue could be avoid.

[laurentj]

At least, the file should be deleted after reading it.

[mdouchin]

NB: during the discussion, we also think a finding a better way to parse big JSON content
https://nenadzivanovic.in.rs/blog/2020/05/28/using-php-streams-to-encode-and-decode-large-json-collections/

[Gustry]

I think we did something in this area, no ?