allow ini_set('error_log',...) with in-memory stream

[staabm]

Description

calling ini_set('error_log', $logger) seems to expect $logger to be a filesystem path (or a magic identifer like "syslog").

is it possible to pass in a memory stream?

use-case: in phpunit we want to capture all output a possible code beeing tested might write into error_log.
I have implemented this feature with a tmpfile() in sebastianbergmann/phpunit#6118 but IMO it would be cleaner and more efficient (no filesystem IO) if I could pass in a memory stream like php://memory or php://temp:

        $stream = fopen('php://temp', 'rw');
        $errorLogPrevious = ini_set('error_log', $stream);

[bwoebi]

ini_set() generally works on strings. I don't think this should change.
However it would be probably nice to introduce and accept custom named php://temp/name:foo streams, which are essentially in-request virtual streams which are stored by their name, which are also usable with php internals (like error_log).

[staabm]

Yes.. I was also thinking whether a separate method like set_error_log_handler or similar should be introduced so we don't need to change the ini_set signature

[mvorisek]

ini_set() generally works on strings. I don't think this should change.

Not sure if this is supported now, but if VFS is already supported, user can (quite easily) register custom scheme handler.

However it would be probably nice to introduce and accept custom named php://temp/name:foo streams, which are essentially in-request virtual streams which are stored by their name, which are also usable with php internals (like error_log).

Does opened path have to match the given one? If not, the in-memory-path can be some unique string obtainable via https://www.php.net/manual/en/function.stream-get-meta-data.php and uri key.