Synchronized Header and Footer with PHP Tutorial

I am trying to edit the header.php from within WordPress but I get an error, see below. Do you think this is a problem with the install or a set limitation?

I have a script that exports data from mysql to a csv file. Everything works great. However, I do not know how to save the csv file to the server.

<?php. function exportCSV(). {. header('Content-type: text/csv');. header('Content-Disposition: attachment; filename=products.csv');.

I want to serve invoices for download. Currently I'm using a simple numbering scheme (invoice-01.pdf, invoice-02.pdf, and so on). I know that I could use ...

I have this code, and it saves to a file and downloads it immediately to the desktop when run from the browser. But I need it to save it on a server.

I want the user to be able to download some files I have on my server, but when I try to use any of the many examples of this around the internet nothing seems ...

<?php header(Content-type:application/pdf); // It will be called downloaded.pdf header(Content-Disposition:attachment ...

Remember that header() must be called before any actual output is sent, either by normal HTML tags, blank lines in a file, or from PHP. It is a very common ...

I need to download http://www.something.com/files/somename.xlsx this file from this PHP file…I tried header('Content-Disposition: attachment; ...

The header() function sends a raw HTTP header to a client. It is important to notice that the header() function must be called before any actual output is sent!