Description:
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I found an failure in the strtotime function. When I used the function strtotime ('next hour/day/week/...') then the result I expected was wrong (The result is one greater).
The similiar function call strtotime('last ...') works correctly.
In PHP Version 4.2.2 (Linux) works the function correctly.

Reproduce code:
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$now = mktime(12,0,0,8,1,2003);
print $now . ', ' . strftime('%A %d. %B %Y - %H:%M:%S', $now);
print strtotime('last hour', $now) . ', ' . strftime('%A %d. %B %Y - %H:%M:%S', strtotime('last hour', $now));
print strtotime('next hour', $now) . ', ' . strftime('%A %d. %B %Y - %H:%M:%S', strtotime('next hour', $now));
print strtotime('last day', $now) . ', ' . strftime('%A %d. %B %Y - %H:%M:%S', strtotime('last day', $now));
print strtotime('next day', $now) . ', ' . strftime('%A %d. %B %Y - %H:%M:%S', strtotime('next day', $now));
print strtotime('last week', $now) . ', ' . strftime('%A %d. %B %Y - %H:%M:%S', strtotime('last week', $now));
print strtotime('next week', $now) . ', ' . strftime('%A %d. %B %Y - %H:%M:%S', strtotime('next week', $now));

Expected result:
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X-Powered-By: PHP/4.2.2
1059732000, Friday 01. August 2003 - 12:00:00
1059728400, Friday 01. August 2003 - 11:00:00
1059735600, Friday 01. August 2003 - 13:00:00
1059645600, Thursday 31. July 2003 - 12:00:00
1059818400, Saturday 02. August 2003 - 12:00:00
1059127200, Friday 25. July 2003 - 12:00:00
1060336800, Friday 08. August 2003 - 12:00:00

Actual result:
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X-Powered-By: PHP/4.3.3RC2-dev
1059732000, Friday 01. August 2003 - 12:00:00
1059728400, Friday 01. August 2003 - 11:00:00
1059739200, Friday 01. August 2003 - 14:00:00
1059645600, Thursday 31. July 2003 - 12:00:00
1059904800, Sunday 03. August 2003 - 12:00:00
1059127200, Friday 25. July 2003 - 12:00:00
1060941600, Friday 15. August 2003 - 12:00:00