PHP classes for a newbie like me... Help plss T_T

**djr33** · 04-14-2010, 01:39 AM

if ($var) is a very messy way to check a value.
Here's why:
if (X) will return true unless X is (1) 0, (2) FALSE, (3) '' (empty string), (4) null; (5) not set*, and possibly other cases that I'm not remembering

*However, this will also give a warning about using a variable that doesn't exist.

There are better ways to do this, and one is:
if (isset($var))

The best way to debug this and to determine what sort of if statement you need is to just use echo $_POST["count"]; (immediately before the if statement).
Then you can decide what to do.

**traq** · 04-14-2010, 04:56 AM

Originally Posted by I am Abby

after hitting the submit the code should run...otherwise not.
The first time you run this...it does not run. If you hit the submit and the page sends the data back to itself it works correctly. After that if you refresh the page I don't want it to work.

That's the problem: if you click Refresh, the browser usually resubmits the POST information. You can avoid this by automatically redirecting the page (you could even simply redirect it to itself) - then if the user refreshes, he'll be refreshing the new page, not the one that just submitted the form. You have to do this before you output anything, so you'll have to pass the information along somehow.

(not tested)

PHP Code:


<?php

// if the form was submitted, process the input
if (isset($_POST['Quote']))
{
$newcount = $_POST['Quote'] = 1;
// instead of echoing the value, redirect ("refresh") the page 
// and pass the value as a query string
header('Location: '.$_SERVER['PHP_SELF'].'?newcount='.$newcount);
}

// if the form was not just submitted (no $_POST['Quote'])
elseif(isset($_GET['newcount']))
{
// if the query string is present, echo the value
echo $_GET['newcount'];
}

// you could also use sessions.

?>

**I am Abby** · 04-14-2010, 08:06 PM

Thanks for the help guys...
It seems to be working now...and better than that, I'm starting to understand why.

However it the line header('Location: '.$_SERVER['PHP_SELF'].'?newcount='.$newcount); kept giving me an error when submitting, so I'm not sure if I'm going to have problems when people refresh the page or not.

**traq** · 04-15-2010, 01:42 AM

What is your error? If it says "Headers already sent", then it's because you've already output something to the browser. header() doesn't work unless the server hasn't sent anything to the browser.

**heavensgate15** · 04-15-2010, 04:24 AM

Ahw, tnx for the replies guyz.... hahahhhaha (sarcastic)... To abby, if you get error in using header, maybe there's a space b4 your <?php .... or something that you output b4 the <?php

If you use the header function:

<space><?php ---> this will generate an error

<?php ---> this will not generate an error

**heavensgate15** · 04-15-2010, 04:39 AM

In summary:

This is wrong when using header function:

<html>
<?php

header("location: blahblahblah.php");

?>
</html>

wrong because there's a tag <html> before the <?php
Just remember that there should be no html tags, spaces, even comments, or what so ever b4 the <?php

**I am Abby** · 04-15-2010, 04:51 PM

Originally Posted by heavensgate15

Ahw, tnx for the replies guyz.... hahahhhaha (sarcastic)... To abby, if you get error in using header, maybe there's a space b4 your <?php .... or something that you output b4 the <?php

If you use the header function:

<space><?php ---> this will generate an error

<?php ---> this will not generate an error

You guys are so smart. I had a dreamweaver created line above <?php after getting rid of it traq's line worked perfectly.

And heavensgate15 (your name makes me smile) I didn't really mean to take over your thread. Your question was so close to what I was needing.

Again thanks boys.

**djr33** · 04-15-2010, 05:27 PM

Watch out for that in dreamweaver. It tends to do annoying things with spacing that in general keep the code clean and organized (so arguably it's helpful), but sometimes do weird things, especially with the issue of the header() function. So don't be surprised if you have this same problem again, but now you know how to fix it.

**traq** · 04-15-2010, 07:52 PM

of course, ANY html editor is going to have issues like that. FrontPage, for example, is far worse.

I use notepad++ for my coding.

**djr33** · 04-15-2010, 09:59 PM

Correct. But to clarify, DW specifically likes to add a return before <?php sometimes.

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