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IDProjectCategoryView StatusLast Update
0001738XdebugStep Debuggingpublic2021-10-04 09:32
ReporterZobo Assigned Toderick  
Status closedResolutionfixed 
Target Version3.1devFixed in Version3.1.0 
Summary0001738: Add xdebug_notify() function to send data through DBGp to a debugging client

While attached to a php program with DBGp, I would like an option to stream arbitrary messages to the IDE over DBGp.

Use case: Framework tracing information in IDE.

DBGp defines "stdout" and "stderr" stream. Currently, there is no way to use "stderr", for example, with "error_log" or similar.

Propose function xdebug_stream_write(stream, text) that would enable the user to send text over an arbitrary stream. This could be complemented with xdebug_stream_create(stream) or similar.

Optionally a streamWrapper could be create for something like:
$s = fopen("dbgp://stderr", "w");

TagsNo tags attached.
Operating System
PHP Version7.4.0-7.4.4



2020-01-23 14:28

reporter   ~0005223

PS: I'm willing to write a patch if this would be considered.


2020-01-27 20:32

administrator   ~0005228


I don't really see a reason why Xdebug could not have something for this, but I do not think that it should use the stream packet for this. The stream packet does not allow for arbitrary data formats, and is really only meant for stdout/stderr. The spec is currently vague on which other stream types are allowed ( has "stdout|stderr"). The stream packet would only be really useful for unstructured data in any case. What I think what instead should be used, is the "notify" functionality ( and This allows for arbitrary XML children that can contain more structured data.

So I would suggest to add a xdebug_notify() method, where the first argument is the notification type (to be prefixed with "xdebug:" as notify's "name" element), the second argument the data (which could be send as base64 encoded data as TEXT data, with NULL allowed for none), and then optionally a third + fourth argument where the third is the name of the custom name space, and the fourth a string containing an XML element with the right custom data type. If you can come up with a different/better API, then I'm open for that as well. But the API/data packet MUST fit in the current DBGp protocol.



2020-02-03 11:55

reporter   ~0005235

Yes, notify would also be useful. However I still like the simple "line based text" approach of stream. I'm not sure if there is a way to hook into STDERR, but, do you think redirecting error_log to that stream? I would also guess that some IDEs could have the stream function already implemented, whereas the notify option would require a tight protocol integration between the php code and IDE...


2021-03-17 09:30

administrator   ~0005752

Is this issue still relevant to you?


2021-03-17 13:57

reporter   ~0005788

Yes, I would still like to have this.
Whether it's stream or notify, I don't have a preference.

I'm going to need to implement both in VSC anyway. stream just makes a bit more sense in a line-by-line based content.

Would you like a patch?



2021-03-17 17:29

administrator   ~0005796

Yes, a patch would be great. I would still prefer a notification for this, and I would also like to pass the specification of this feature on to the PhpStorm . They often have good ideas. So I think it would be best to start there?


2021-03-18 09:39

reporter   ~0005800

Yes, that makes perfect sense. I probably won't be able to get to this for a couple of days. Perhaps we can start with telling them what the general idea behind this is:

A way for PHP to send application logs to IDE.
For example a PHP CMS could have application level tracing implemented and while debugging it would help the developer to also see those in the same IDE.
An example of that could be Visual Studio and .NET where the output window shows things logged via Trace class calls. In case of windows this is neither stdout or stderr but a special OS feature - I'm oversimplifying.
This could probably be solved with the existing DBGp stderr stream, but as far as I see this is not implemented due to technical limitations.

Proposed implementations are either <stream> or <notify> where in both cases we'd need to think about if the IDE should have an option to opt in and out of this specific data stream. We also need to think about other DBGp implementation (lua, python...).

I'm of course open to an alternative way to solve this feature, even if we can leverage something already in DBGp/Xdebug.


2021-06-04 07:51

administrator   ~0005893


2021-06-04 13:32

administrator   ~0005894

This has now been merged as the "xdebug_notify()" function. I'm open to changing this, or adding additional arguments to this, but it should be a good base line for you to have a good look at.

Issue History

Date Modified Username Field Change
2020-01-23 14:25 Zobo New Issue
2020-01-23 14:28 Zobo Note Added: 0005223
2020-01-27 20:32 derick Assigned To => derick
2020-01-27 20:32 derick Status new => feedback
2020-01-27 20:32 derick Note Added: 0005228
2020-02-03 11:55 Zobo Note Added: 0005235
2020-02-03 11:55 Zobo Status feedback => assigned
2020-03-12 16:23 derick Severity minor => feature
2020-03-12 16:25 derick Category Feature/Change request => Remote Debugging
2020-03-12 16:33 derick Category Remote Debugging => Step Debugging
2021-03-17 09:30 derick Status assigned => feedback
2021-03-17 09:30 derick Note Added: 0005752
2021-03-17 13:57 Zobo Note Added: 0005788
2021-03-17 13:57 Zobo Status feedback => assigned
2021-03-17 17:29 derick Note Added: 0005796
2021-03-18 09:39 Zobo Note Added: 0005800
2021-05-14 15:49 derick Target Version => 3.1dev
2021-06-03 16:54 derick Summary Ability to send text over stream. => Add xdebug_notify() function to send data through DBGp to a debugging client
2021-06-04 07:51 derick Status assigned => confirmed
2021-06-04 07:51 derick Note Added: 0005893
2021-06-04 13:32 derick Status confirmed => closed
2021-06-04 13:32 derick Resolution open => fixed
2021-06-04 13:32 derick Fixed in Version => 3.1dev
2021-06-04 13:32 derick Note Added: 0005894
2021-09-05 16:15 derick Fixed in Version 3.1dev => 3.1.0beta1
2021-10-04 09:32 derick Fixed in Version 3.1.0beta1 => 3.1.0