Description:
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When doing an #include virtual of a php file this seems to change to an include() call (and thus hit basedir restrictions) when the base PHP file reaches a certain size.  Also connected with this behaviour is sub-virtual requests also stop working.  This seems baffling as this behaviour should occur purely in Apache.  Use of virtual() seems to also trigger this bug.

Reproduce code:
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This URL works normally:
http://red-velvet.lancs.ac.uk:8080/~tipper/include/base/index.php?amount=200

This URL demonstrates the bug:
http://red-velvet.lancs.ac.uk:8080/~tipper/include/base/index.php?amount=350

To see how this is affected by setting open_basedir="/usr/local/lib/php:/tmp:." then check these URLs:

Working: http://red-velvet.lancs.ac.uk:8080/~tipper/include/base/index.php?amount=200&basedir=1

Broken: 
http://red-velvet.lancs.ac.uk:8080/~tipper/include/base/index.php?amount=350&basedir=1

The "?amount=N" adds more output lines to the main PHP file thus changing its size in an easy manner.

All code available from http://red-velvet.lancs.ac.uk:8080/~tipper/include/include-test.tar.gz

Expected result:
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The #include virtual (or virtual()) data should continue to behave as normal, and shouldn't fall foul of basedir restrictions.  The following block should always appear at the top of the output:

This is an included file /~tipper/include/subdir/test.php
Request was /~tipper/include/base/index.php?amount=200
This is an included file /~tipper/include/subdir/test2.php
Request was /~tipper/include/base/index.php?amount=200
End of included file /~tipper/include/subdir/test2.php
End of included file /~tipper/include/subdir/test.php

(Where 200 will be whatever number you set for amount= )


Actual result:
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Once the amount goes above about 340 lines this seems to be the output (from http://red-velvet.lancs.ac.uk:8080/~tipper/include/base/index.php?amount=350 )

This is an included file /~tipper/include/base/index.php
Request was /~tipper/include/base/index.php?amount=350
End of included file /~tipper/include/base/index.php

If you try this with open_basedir set to "/usr/local/lib/php:/tmp:." you get the following error (from http://red-velvet.lancs.ac.uk:8080/~tipper/include/base/index.php?amount=350&basedir=1 )


Warning: main() [function.main]: open_basedir restriction in effect. File(/home/tipper/public_html/include/subdir/test.php) is not within the allowed path(s): (/usr/local/lib/php:/tmp:.) in /home/tipper/public_html/include/base/index.php on line 30

Warning: main(/home/tipper/public_html/include/subdir/test.php) [function.main]: failed to open stream: Operation not permitted in /home/tipper/public_html/include/base/index.php on line 30

Warning: main() [function.include]: Failed opening '/home/tipper/public_html/include/subdir/test.php' for inclusion (include_path='.:/usr/local/lib/php') in /home/tipper/public_html/include/base/index.php on line 30