First, Thank you all for your help!
I finally found the reason for why does the IE always show info as below:
"Parse error: parse error, expecting `T_STRING' or `T_VARIABLE' or
`T_NUM_STRING' in c:\program files\apache
group\apache\htdocs\web\site1\list.php on line --[the number of line]"
It is because the echo (including print) doesn't work at the line
echo "<tr><td><a href=\"profile.php?id=$arr['user_id']\" target='_top'>";
showing the error info as I mentioned. ( but it should work according to PHP
It only works when the $arr['user_id'] is out of the quotes.
echo "<tr><td><a href=\"profile.php?id=".$arr['user_id']."\"
then IE showed no error any longer.
So I have to let all $arr['key'] out of the quotes, then the scripts are
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