Forms

A form's action says where the data goes. action="" means "send it back to this same page".

1.7-form.html — A form that posts to another page
Sends to 7-results.php, which receives and displays it.
 2.8.php — A form that submits to itself
One file that shows the form and handles the answer. This is the pattern you will use most.
 3.specialMission.php — Practice: reading several fields 4.specialMission2.php — Practice: build a table from form input 5.textArea.php — A rich text editor
TinyMCE, plus htmlentities() for handling HTML the user typed.
 6.fileUpload.php — Receiving an uploaded file
The $_FILES array.
 7.fileDownload.php — Sending a file back as a download
Uses headers to turn PHP output into a downloadable CSV.