StackOverflow question 68537359

form.html

<!-- Here is the HTML form. -->
<form action="process.php" method="post">
<input type="text" placeholder="Your Value" name="text" />
<input type="submit" value="Send" />
</form>

process.php

<?php
// Since you have PHP on your web
// server, save this as 
// 'process.php' on your server.
if (isset($_POST['text']) {
   $text = $_POST['text'];
   $handle = fopen('yourfile.txt', 'a+');
   $status = fwrite($handle, $text."\n");
   if ($status) {
      echo 'Write completed';
      exit(0);
   } else {
      echo 'Oops! We couldn\'t write the data!';
      exit(1);
   }
} else {
    echo 'Enter your text <a href="form.html">here</a>.';
    exit(1);
?>

yourfile.txt

// Values are added here.
value1
value2
value3