Creating a Simple Input Form
For now, let's keep our HTML separate from our PHP code. Listing 10.1 builds a simple HTML form.
Listing 10.1. A Simple HTML Form
1: <html> 2: <head> 3: <title>A simple HTML form</title> 4: </head> 5: <body> 6: <form action="send_simpleform.php" method="POST"> 7: <p><strong>Name:</strong><br> 8: <input type="text" name="user"></p> 9: <p><strong>Message:</strong><br> 10: <textarea name="message" rows="5" cols="40"></textarea></p> 11: <p><input type="submit" value="send"></p> 12: </form> 13: </body> 14: </html>
Put these lines into a text file called simpleform.html, and place that file in your Web server document root. This listing defines a form that contains a text field with the name "user" on line 8, a text area with the name "message" on line 10, and a submit button on line 12. The FORM element's ACTION argument points to a file called send_simpleform.php, which processes the form information. The method of this form is POST, so the variables are stored in the $_POST superglobal.
Listing 10.2 creates the code that receives our users' input.
Listing 10.2. Reading Input from a Form
1: <?php 2: echo "<p>Welcome <b>$_POST[user]</b>!</p>"; 3: echo "<p>Your message is:<br><b>$_POST[message]</b></p>"; 4: ?>
Put these lines into a text file called send_simpleform.php, and place that file in your Web server document root. Now access the form itself (simpleform.html) with your Web browser, and you should see something like Figure 10.1.
Figure 10.1. Form created by simpleform.html.
The script in Listing 10.2 is called when the user submits the form created in Listing 10.1. In the code in Listing 10.2, we access two variables: $_POST[user] and $_POST[message]. These are references to the variables in the $_POST super-global, which contain the values that the user entered in the user text field and the message text area. Forms in PHP really are as simple as that.
Enter some information in the form fields, and click the send button. You should see your input echoed to the screen.
By the Way
You could also use the GET method in this form (and others). POST can handle more data than GET and does not pass the data in the query string. If you use the GET method, be sure to change your superglobal to $_GET and not $_POST.