Description:
------------
Since php 5.2.9 modify function behaviour have change, in both case "next $weekday" always go to the next specified weekday ("next weekday" > "today"), but in 5.2.9 and 5.2.10 "+1 $weekday" go to the first encoutered specified weekday including today ("next weekday" >= "today"). 

The behaviour of older php versions seems more logical to me, '+1' should have the same behaviour than 'next'.

Reproduce code:
---------------
// Since php 5.2.9
$date  = new Datetime("2009-06-01");
$date->modify("+1 ".$date->format("l")); // == ('+1 monday')
echo $date->format("Y-m-d")."\n"; 
$date->modify("next ".$date->format("l")); // == ('next monday')
echo $date->format("Y-m-d")."\n"; 


Expected result:
----------------
2009-06-08
2009-06-08

Actual result:
--------------
2009-06-01
2009-06-08