Topic 4A

This is the thread for problems/comments related to Topic 4A.

I have successfully completed this topic. And the more I work with PHP, the more I like it!

Hello..

Ok, started topic 4A.

4A-1: Works fine.

Except, I get an error here when I debug:

foreach ($choice as $category) {


But it still processed the form OK.

------

Now, 4B-1 (I know there is a thread for 4B but 4A and 4B are linked)

NOW I'm having trouble with the form, and this error is shown:

Warning: Invalid argument supplied for foreach() in c:\foxserv\www\studentphp\thankyou.php on line 46

And unless I find out where I'm making my mistakes, I can't go any futher because 4B-1 etc all work off the PHP files I'm editing.

I am having a similar problem to Alice, but mine doesn't work at all.

I get this error:

Warning: Invalid argument supplied for foreach() in C:\foxserv\www\studentphp\thankyou.php on line 8


My code is:

<?php
$title ="Thank you";
include("header.php";
echo "Thanks for responding to this survey $firstname $lastname";
echo "<br><br>";
echo "<b>These are your favourite book categories:</b>";
echo "<br><br>";
foreach ($choice as $category) {
echo "$category <br>\n";
}
include("footer.php";
?>

What I don't understand is how it knows to print the value? How does $category automatically become associated with the checkbox's value.

Topic completed

I don't have the manual with me now - check http://www.evolt.org/these-things-i-know-php-tips for this

foreach ($_GET as $key => $value) //$_POST in the actual example
$$key = $value;
?> to gather

I'll check tomorrow.

I have completed the topic.

The manual is sometimes badly written (we didn't write it) for beginners.

Here's the logic - you're getting the invalid argument error despite the fact that your cod eis correct (it's the same in the handbook). That should tell you that the problem perhaps lies with the form.

Copy the following to the top of thankyou.php

print_r($_POST);

This will show you (in an array) what variables arrived at this page. You'll see it is empty Array() (this does not refer to the array in bookform.php - it gives you an array of all variables, even an array of an array - passed.

VERY useful - keep it close by.

So, since it's empty, we know the problem lies with the form.

The problem is that <?php ?> tags are missing around choice[] - how can php use choice[] to create an array if php is not involved?

So simply add tags

<?php
echo "<input name='choice[]' type='checkbox' value='Fiction'>Fiction
<br>

<input name='choice[]' type='checkbox' value='Non-fiction'>Non-fiction
<br>

<input name='choice[]' type='checkbox' value='Theater'>Theater
<br>

<input name='choice[]' type='checkbox' value='Computing'>Computing
<br>

<input name='choice[]' type='checkbox' value='Science'>Science
<br>
<br>

<input type='submit'>";
?>


or, if you want like this

<input name=<?php echo "choice[]"; ?> ...

all done. no problems

do I need to insert this

foreach ($_GET as $key => $value) //$_POST in the actual example
$$key = $value;
?> to gather

into thankyou.php?