Description:
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The difference in strtotime() output in different PHP versions on Windows XP SP3 and CentOS.

Reproduce code:
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$start_date = '2009-04-16'; // thursday
$fdate = strtotime($start_date . " +1 thursday");
echo date ( 'Y-m-d', $fdate );

Expected result:
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2009-04-23


Actual result:
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In PHP 5.2.6 will output:

2009-04-23

In PHP 5.2.8 and 5.2.9 will output:

2009-04-16