ISSET() question

[major]

The following code processes a blank field as though it has some value
and proceeds as though it was set to some value.

Apparently isset() is not working, because it thinks that a blank text
field is set to something.

Please let me know how to use isset() correctly.

Thanks ahead.

<?php
if(!isset($_POS T['varA'])||!isset($_POS T['varB'])){
?>
<form action="isset.p hp" method="POST">
<table><tr>
<td>Value 1:</td><td><input type="text" name="varA" value=""></td></
tr>
<tr><td>Value 2:</td><td><input type="text" name="varB" value=""></
td></tr>
<tr><td colspan="2"><in put type="submit" value="submit"> </td></tr>
</table>
</form>
<?php
}

else {
$x=$_POST['varA'];
$y=$_POST['varB'];

if($x>$y){
echo "Value 1:".$x." is larger";
}else

echo "Value 2:".$y." is larger";
}

?>

[good]

In article <13************ *@corp.supernew s.com>, no****@example. com
says...

Otherwise - just how "efficient" do you need a $_POST test to be?
Stop worrying - do it and move on. That what script languages like PHP
are for.

If regex is troubling you or you want to do more validation I'd take a
look at www.streamforensics.com to automate your forms validations.
Their system makes life a whole lot easier in so many ways.

You probably have more pressing problems than the one you are worrying
about?

Jeez, people - I was just asking. I don't know everything about PHP, and
was simply admitting there might be a better way than mine.

Is the moon full or something? People seem to be awfully touchy lately.

Tony - I wasn't having a go I was just trying to explain why I didn't
think it worth worrying about instead of just saying so.

Sorry if it read bad to you.