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";
}

?>

[Guillaume]

Re: ISSET() question

major a écrit :

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

Exactly, "blank" is still a value. isset just verify that the variable
*is set*, whatever its content.

Regards,
--
Guillaume

[mail.cedric.chevalier@gmail.com]

Re: ISSET() question

On 28 fév, 08:51, major <extreme...@gma il.comwrote:

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";
>
}
>
?>

use empty() :

if ( ( isset($_POST['varA'] && !empty($_POST['varA']) ) || ...

ichevc

[Mason Barge]

Re: ISSET() question


"major" <extremerep@gma il.comwrote in message
news:b2bd51d2-34e5-472a-868b-55681f053d7b@p4 3g2000hsc.googl egroups.com...

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.

This one, I actually can help with :)

This page will save you a lot of grief if you take a few minutes to read and
understand it:

http://us3.php.net/manual/en/types.comparisons.php

[Tony]

Re: ISSET() question

major wrote:

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.

Yes, if the value of a field is "", then it is still set. You would want
to test for both:

if ( isset($_POST['name']) && ($_POST['name'] != "") ) ...

Or, if you want to count " " as blank:


if ( isset($_POST['name']) && (trim($_POST['name']) != "") ) ...

There may be a more efficient way to do this - anyone know of one?

[Norman Peelman]

Re: ISSET() question

Tony wrote:

major wrote:

>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.

>
Yes, if the value of a field is "", then it is still set. You would want
to test for both:
>
if ( isset($_POST['name']) && ($_POST['name'] != "") ) ...
>
Or, if you want to count " " as blank:
>
>
if ( isset($_POST['name']) && (trim($_POST['name']) != "") ) ...
>
There may be a more efficient way to do this - anyone know of one?

Yes, validate it with a regex also:

$name = (isset($_POST['name']) &&
eregi('^[a-zA-Z]${2,25}',$_POST['name'])) ? $_POST['name'] : false;

if (!$name)
{
....
}

would check to see if the post variable has been set and if it matches a
string of alpha a-z (upper & lower case), and is at least 2 characters
but not more than 25 characters in length. If not it's set to false and
you take appropriate action.

--
Norman
Registered Linux user #461062

[Tony]

Re: ISSET() question

Norman Peelman wrote:

Tony wrote:

>major wrote:

>>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.

>>
>Yes, if the value of a field is "", then it is still set. You would
>want to test for both:
>>
>if ( isset($_POST['name']) && ($_POST['name'] != "") ) ...
>>
>Or, if you want to count " " as blank:
>>
>>
>if ( isset($_POST['name']) && (trim($_POST['name']) != "") ) ...
>>
>There may be a more efficient way to do this - anyone know of one?

>
Yes, validate it with a regex also:
>
$name = (isset($_POST['name']) &&
eregi('^[a-zA-Z]${2,25}',$_POST['name'])) ? $_POST['name'] : false;
>
if (!$name)
{
....
}
>
would check to see if the post variable has been set and if it matches a
string of alpha a-z (upper & lower case), and is at least 2 characters
but not more than 25 characters in length. If not it's set to false and
you take appropriate action.
>

But what if I don't want to validate according to those rules?

[Jerry Stuckle]

Re: ISSET() question

Tony wrote:

Norman Peelman wrote:

>Tony wrote:

>>major wrote:
>>>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.
>>>
>>Yes, if the value of a field is "", then it is still set. You would
>>want to test for both:
>>>
>>if ( isset($_POST['name']) && ($_POST['name'] != "") ) ...
>>>
>>Or, if you want to count " " as blank:
>>>
>>>
>>if ( isset($_POST['name']) && (trim($_POST['name']) != "") ) ...
>>>
>>There may be a more efficient way to do this - anyone know of one?

>>
>Yes, validate it with a regex also:
>>
>$name = (isset($_POST['name']) &&
>eregi('^[a-zA-Z]${2,25}',$_POST['name'])) ? $_POST['name'] : false;
>>
>if (!$name)
>{
> ....
>}
>>
>would check to see if the post variable has been set and if it matches
>a string of alpha a-z (upper & lower case), and is at least 2
>characters but not more than 25 characters in length. If not it's set
>to false and you take appropriate action.
>>

>
But what if I don't want to validate according to those rules?
>

Then make up your own rules. And accept that if you don't do it right,
someone can delete your entire database - or at least an entire table.

--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attgl obal.net
=============== ===

[Norman Peelman]

Re: ISSET() question

Tony wrote:

Norman Peelman wrote:

>Tony wrote:

>>major wrote:
>>>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.
>>>
>>Yes, if the value of a field is "", then it is still set. You would
>>want to test for both:
>>>
>>if ( isset($_POST['name']) && ($_POST['name'] != "") ) ...
>>>
>>Or, if you want to count " " as blank:
>>>
>>>
>>if ( isset($_POST['name']) && (trim($_POST['name']) != "") ) ...
>>>
>>There may be a more efficient way to do this - anyone know of one?

>>
>Yes, validate it with a regex also:
>>
>$name = (isset($_POST['name']) &&
>eregi('^[a-zA-Z]${2,25}',$_POST['name'])) ? $_POST['name'] : false;
>>
>if (!$name)
>{
> ....
>}
>>
>would check to see if the post variable has been set and if it matches
>a string of alpha a-z (upper & lower case), and is at least 2
>characters but not more than 25 characters in length. If not it's set
>to false and you take appropriate action.
>>

>
But what if I don't want to validate according to those rules?

What rules do you want to validate by?

--
Norman
Registered Linux user #461062

[Mason Barge]

Re: ISSET() question


"Tony" <nospam@example .comwrote in message
news:13senkbp28 96814@corp.supe rnews.com...

major wrote:

>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.

>
Yes, if the value of a field is "", then it is still set. You would want
to test for both:
>
if ( isset($_POST['name']) && ($_POST['name'] != "") ) ...
>
Or, if you want to count " " as blank:
>
>
if ( isset($_POST['name']) && (trim($_POST['name']) != "") ) ...
>
There may be a more efficient way to do this - anyone know of one?

if($_POST['name']) {

This will, however, evaluate 0 and "0" to false. It will also throw a
warning. !empty() is exactly the same thing, but does not throw a warning.

[good@respnse.sic.com]

Re: ISSET() question

In article <13sjj08ge122ic f@corp.supernew s.com>, nospam@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.