Honor PHP temp directory config

[mvorisek]

Fixed /tmp directory can be outside open_basedir scope. This fixes it using PHP config which is expected to be correct (and sys_get_temp_dir will return /tmp by default if no config is set).

[mvorisek]

@sebastianbergmann Can you merge?

[theseer]

While using sys_get_temp_dir probably makes sense and I'm inclined to merge this PR for that reason alone, I fail to see where an open_basedir restriction might be an issue? The PR addresses a test. Tests are run on CLI. I don't know why any sane admin would restrict access to /tmp for a CLI process...?

In what scenario would that be plausible?

[mvorisek]

@theseer

While using sys_get_temp_dir probably makes sense and I'm inclined to merge this PR for that reason alone, I fail to see where an open_basedir restriction might be an issue? The PR addresses a test. Tests are run on CLI. I don't know why any sane admin would restrict access to /tmp for a CLI process...?

In what scenario would that be plausible?

Hi, for example in our enviroment we have PHP temp dir set to some /tmp/xxx subdir and only this dir set in open_basedir.

[theseer]

Fair enough.