Description:
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I think strtotime() and probably the more general "Date and Time Functions" chapter need these additions:

1. Daylight Savings Time stuff should be explained; it should be clearly stated that one can't do integer arithmetics right with timestamps because of DST. At least strtotime() handles this correctly (another option is maketime()), so it should be used whenever, say, we need to add 7 days to a date as in strtotime('+7 days', $Date),
while this is wrong: $Date+=7*24*3600. 
This will prevent a lot of developers new to the date&time issue from stumbling over the problem and reporting another "bug" answered with a congratulation on DST discovery. 

2. Descriptions of all the formats for the "time" parameter in strtotime() should be included in the PHP documentation itself; providing just a link to GNU Tar Date formats does not necessarily leads to following the link and therefore leads to misunderstanding of the "time" parameter formats, hence to another wave of "bug" reports about "next [weekday]" unexpected behavour. 

Reproduce code:
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Current (online) strtotime() documentation

Expected result:
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I think people should be able to know what strtotime() will return and avoid the described pitfalls when they have read the PHP docs alone