Description:
------------
This would be great if you could set it to the home directory, for example.

open_basedir="~:/tmp:/pearpath"

And then ~ would end up being the users home directory (that is running the 
script).

So if the user was smith, it would be like:

open_basedir="/home/smith:/tmp:/pearpath"

But only for that script. 

Test script:
---------------
<?php
# Running as smith
# open_basedir="~:/tmp:/pearpath"
# All "public" directory's are CHMOD to 777

// Test 1
touch("/tmp/test"); // pass

// Test 2
touch("/home/smith/public/test"); // pass

// Test 3
touch("/home/john/public/test"); // fail

?>

Expected result:
----------------
Test 3 should fail.

Actual result:
--------------
Test 3 passes.