How to Write a Basic Text File in PHP for HTML5 and CSS3 Programming

Often, you'll want to do something in PHP as simple as record information from a form into a text file for HTML5 and CSS3 programming. Here is a simple program that responds to a form and passes the input to a text form.

image0.jpg

The code for this form is basic HTML.

When the user enters contact data into this form, it will be passed to a program that reads the data, prints out a response, and stores the information in a text file.

image1.jpg

The more interesting behavior of the program is not visible to the user. The program opens a file for output and prints the contents of the form to the end of that file. Here are the contents of the data file after a few entries:

first: Andy
last: Harris
email: andy@aharrisbooks.net
phone: 111-1111
first: Bill
last: Gates
email: bill@Microsoft.com
phone: 222-2222
first: Steve
last: Jobs
email: steve@apple.com
phone: 333-3333
first: Linus
last: Torvalds
email: linus@linux.org
phone: 444-4444
first: Rasmus
last: Lerdorf
email: rasmus@php.org
phone: 123 456 7890

The program to handle this input is not complicated. It essentially grabs data from the form, opens up a data file for output, and appends that data to anything already in the file. Here's the code for addContact.php:

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>addContact.html</title>
 <link rel = "stylesheet"
  type = "text/css"
  href = "contact.css" />
</head>
<body>
 <?php
 //read data from form
 $lName = filter_input(INPUT_POST, "lName");
 $fName = filter_input(INPUT_POST, "fName");
 $email = filter_input(INPUT_POST, "email");
 $phone = filter_input(INPUT_POST, "phone");
 //print form results to user
 print <<< HERE
 <h1>Thanks!</h1>
 <p>
  Your spam will be arriving shortly.
 </p>
 <p>
 first name: $fName <br />
 last name: $lName <br />
 email: $email <br />
 phone: $phone
 </p>
HERE;
 //generate output for text file
 $output = <<< HERE
first: $fName
last: $lName
email: $email
phone: $phone
HERE;
 //open file for output
 $fp = fopen("contacts.txt", "a");
 //write to the file
 fwrite($fp, $output);
 fclose($fp);
 ?>
</body>
</html>

The process is straightforward:

  1. Read data from the incoming form.

    Just use the filter_input mechanism to read variables from the form.

  2. Report what you're doing.

    Let users know that something happened. As a minimum, report the contents of the data and tell them that their data has been saved. This is important because the file manipulation will be invisible to the user.

  3. Create a variable for output.

    In this simple example, you print nearly the same values to the text file that you reported to the user. The text file does not have HTML formatting because it's intended to be read with a plain text editor. (Of course, you could save HTML text, creating a basic HTML editor.)

  4. Open the file in append mode.

    You might have hundreds of entries. Using append mode ensures that each entry goes at the end of the file, rather than overwriting the previous contents.

  5. Write the data to the file.

    Using the fput() or fwrites() function writes the data to the file.

  6. Close the file.

    Don't forget to close the file with the fclose() function.

The file extension you use implies a lot about how the data is stored. If you store data in a file with an .txt extension, the user will assume it can be read by a plain text editor.

The .dat extension implies some kind of formatted data, and .csv implies comma-separated values. You can use any extension you want, but be aware you will confuse the user if you give a text file an extension like .pdf or .doc.

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