Description:
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first i define a is 8 and b is 6.
When i use echo "a+b=".$a+$b."<br>"; 
the MS IE show the result is 2.
While i use echo "a+b="; echo $a+$b."<br>";
the result is correct!
the same result when use "-" operator  use a line command.
but the result is correct when i use * and /
i cannnot fix it!

Reproduce code:
---------------
<?php
$a = 8;
$b = 2;
$c = 3;
echo "a+b=".$a+$b."<br>";
echo "a-b=".$a-$b."<br>";
echo "a*b=".$a*$b."<br>";
echo "a/b=".$a/$b."<br>";
echo "a%c=".$a%$c."<br>";
echo "a++ is ".$a++;
?>

Expected result:
----------------
2
-2
a*b=16
a/b=4
a%c=2
a++ is 8 

Actual result:
--------------
a+b=10
a-b=6
a*b=16
a/b=4
a%c=2
a++ is 8