stream_get_meta_data does not set "mode" for pipe streams
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php5 incompatibility
php7 incompatibility
probably easy
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Description
When fetching the mode using `stream_get_meta_data` I get an empty string instead of the mode used to open the stream if a stream is opened using `popen`.
PHP does return the mode used with `popen` (tested with PHP 7.0.4).
### HHVM Version
Tested with hhvm 3.13.1.
3v4l.org reports the same result with hhvm versions 3.9.1 through 3.12.0.
### Code to reproduce problem
``` php
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