Need help w/writing CHECKBOX data

[rosario]

How to I write to my .txt file, the data captured from a series of checkboxes?

The value of the checkbox is displayed on the processed page, but nothing gets written to the .txt file.

Here's my code:

<?

$number=count($checkbox);
for($a=0;$a<=$number;$a++)

{
echo $checkbox[$a];
}

$outputstring = $checkbox[$a]."\n";

// open file for appending
@ $fp = fopen("checkbox.txt", "a");

flock($fp, 2);

fwrite($fp, $outputstring,strlen ( $outputstring ));
flock($fp, 3);
fclose($fp);

?>

[linus]

Can you give us the HTML code for the form that has the checkboxes? The value of a checkbox will be "on" if it was checked, and null if it wasn't.

[rosario]

Here is the HTML code used in my form:

<input type="checkbox" name="checkbox[]" value="Cat">
<input type="checkbox" name="checkbox[]" value="Dog">
<input type="checkbox" name="checkbox[]" value="Mouse">

On the proccessed page, the value gets displayed based on which boxes were checked, but can't figure out whey it will not write to my .txt file.

[linus]

Well, I just noticed this part of your code:

// open file for appending
@ $fp = fopen("checkbox.txt", "a");

What's that "@" doing there? If you want to hide errors created by the function, put the @ before the function, not at the start of the line.

Is this part working?

$number=count($checkbox);
for($a=0;$a<=$number;$a++)
{
echo $checkbox[$a];
}

[rosario]

This part is working:

$number=count($checkbox);
for($a=0;$a<=$number;$a++)
{
echo $checkbox[$a];
}

I have some other pieces of code for my text boxes (my html form contains both text input boxes and checkboxes).

This is working, and writes the text (from the input text boxes) to the .txt file.

// open file for appending
@ $fp = fopen("checkbox.txt", "a");

[linus]

It should be writing the LAST checkbox value. I just noticed that once your for loop is done, you do this:

$outputstring = $checkbox[$a]."\n";

and then write $outputstring to the text file. That will only write the last checkbox value to the file, since that statement and the writing statement are outside of the for loop... so if the last checkbox was unchecked, that would mean nothing from the checkboxes gets written to the file. Otherwise, I don't know why it wouldn't work. =\