[Bug 702957] Re: libgv-php5 gv::render() function does not output to browser

[Poru]

As far as I understand, the attached code, which uses

gv::renderresult (graph_handle, string format, string outdata);

should render to the outdata string. Since I have not echo'd the string,
the attached example should not output anything. However, this code
appears to render flawlessly for the following versions of graphviz:

2.26.3-5ubuntu4 (current detfault libgv-php5 package on Ubuntu 11.10 64bit)
2.28.0 (latest stable, custom built from source)
2.29.201206013.0446 (latest development, custom built from source)

which suggests that the renderresult function is not behaving as it is
supposed to. It is behaving more like the gv::render function should
behave. This example fails to work at all for v2.20.2 - even if the
output string is echoed manually.

In summary it looks like the php bindings have been broken since at
least v2.20.2 and it would be good if this could be fixed because
graphviz without the ability to render is pretty useless. Thanks.

** Attachment added: "This test case renders output for versions greater than 2.20.2"
   https://bugs.launchpad.net/ubuntu/+source/graphviz/+bug/702957/+attachment/3187620/+files/gv-test.works.gt.2.20.2.php

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https://bugs.launchpad.net/bugs/702957

Title:
  libgv-php5 gv::render() function does not output to browser

Status in “graphviz” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: graphviz

  Ubuntu info:
  Description:	Ubuntu 10.10
  Release:	10.10
  libgv-php5:
    Installed: 2.26.3-4

  Using the gv::render() function in PHP with two arguments, the binary
  data of the graph image should be output inline (have tried with
  several different output types). That is, a web browser should receive
  the image when visiting the PHP page. Instead, no data is output. This
  worked on Lucid.

  When running the script from the command line, the function works as
  expected. i.e. binary data is output to stdout. Also when using the 3
  argument form of gv::render() to save to a file, accessed via the web,
  the image file is correctly generated.

  Note for testing: you'll need to add the file gv.ini to
  /etc/php5/apache2/conf.d containing "extension=gv.so" to get the
  extension loading in PHP. Attached is a PHP file that needs write
  access from the apache user to the output.log and graph.png files.

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