Isset function does not work

manishnankar

I have declared one field fname . and checking whether particular field is available or not using isset. Its not working.

My code is :

<html>
<body>
<form action ="uploadphp.php" method = "post" >
FName : <input type ="text" name = "fname"> <br /><br />
SName : <input type ="text" name = "sname"> <br /><br />
<input type ="submit" name "submit" value = "submit" /> <br/>
</form>
</body>

<?php

if (isset($_GET['fname']))
{
Echo "presence";
}
else
{
die ("error");
}

</html>

above code gives me message as error.

Basically the field is present , so it should give me the presence.

i have turn off register_globals in php.ini file.

Please let me know what is wrong with this code.

//Manish n

jeepin81

you have a couple issues. You're missing the '=' sign in the name attribute in your submit button and your form method is via POST but you're trying to retrieve your variable via GET.


<html>
<body>
<form action ="uploadphp.php" method = "GET" >
FName : <input type = "text" name = "fname"> <br /><br />
SName : <input type = "text" name = "sname"> <br /><br />
<input type = "submit" name = "submit" value = "submit" /> <br/>
</form>
</body>

<?php

if (isset($_GET['fname']))
{
echo "presence";
}
else
{
die ("error");
}
?>

traq

also, note that this will only work if this script is submitting to itself.

is this script "uploadphp.php"?

if "uploadphp.php" is a different script, then you need to check for the form submission in that script.

socipoet

The isset function in the above code may not do anything since your form action goes to another page (if it did not it would have the self action: action="<?php echo $PHP_SELF; ?>")

You must employ the following condition if (isset($_POST['Submit1'])) { } on your redirected page and then use isset to find if the fname has been entered.

I hope this helps!

bradgrafelman

Just setting a few things straight before this thread goes too far off course before the OP even has a chance to respond...

socipoet;10993595 wrote:
The isset function in the above code may not do anything since your form action goes to another page (if it did not it would have the self action: action="<?php echo $PHP_SELF; ?>")

But where do you define the variable $PHP_SELF? And how do you know that it goes to a "different page?" What if uploadphp.php is indeed the file we're looking at?

socipoet;10993595 wrote:
You must employ the following condition if (isset($_POST['Submit1'])) { } on your redirected page and then use isset to find if the fname has been entered.

No he mustn't, and for a couple of reasons, such as:

He has no form element named Submit1, so that if() statement would never evaluate to true.
[man]isset/man doesn't tell you whether or not data was entered for a given form field (a blank/empty submitted form field is different than a nonexistent one).

traq

bradgrafelman;10993600 wrote:
...[man]isset/man doesn't tell you whether or not data was entered for a given form field (a blank/empty submitted form field is different than a nonexistent one).

indeed. [man]empty/man might be more appropriate in this case (which checks if a variable is not set or has no value (or a value that equates to being "empty," such as [font=monospace]FALSE[/font], [font=monospace]NULL[/font], [font=monospace]0[/font], or an empty string or array)).