Description:
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When using strtotime to determine the date of a particular day last week or next week using a given value for $now we get results that we would not be expecting. I get the values I am expecting when using PHP 5.3.2

Test script:
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$time = mktime(0, 0, 0, 4, 7, 2010);
echo date('Y-m-d H:i:s', strtotime('Tuesday last week', $time));
echo "\n";
echo date('Y-m-d H:i:s', strtotime('Tuesday this week', $time));

Expected result:
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2010-03-30 00:00:00
2010-04-06 00:00:00


Actual result:
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2010-04-06 00:00:00
2010-04-13 00:00:00