Andrew Ruthven 48efbb272b Fix Fatal PHP Error if Depth is more than 1.
Merge request was proposed by xhess on GitLab, but the commit
had no content. I've solved it, possibly the same way.

For the initial commit:
Executing the second example at https://wiki.davical.org/index.php?title=PROPFIND
The "Depth: 2" header is the problem. Setting the depth header larger than 1
causes the function "compare_val_with_re" to be defined again. Now checking if
the function has already been defined fixes the problem.
2018-11-12 19:32:34 +13:00
..
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