I have always believed that the most fun way to learn a new programming language, whether it is a language like C or a scripting language like PHP, is to use it to write a real-life useful program. Of course this is not the most systematic method of learning, but it works well if you already have some background in programming.
Before you write your first PHP program, make sure that your website is running on a web host that runs PHP 4.1 or above.
You may also find it useful to have a copy of PHP 4.1 or later installed on your own computer. This makes testing your PHP scripts much easier. If you use Windows, you can find some tips on installing PHP on your own computer from my article on "How to Install and Configure PHP 5 to Run with Apache on Windows" at http://www.thesitewizard.com/php/install-php-5-apache-windows.shtml
And of course, you will need an ASCII text editor of some kind (such as Notepad on Windows). There's a list of such editors on http://www.thefreecountry.com/programming/editors.shtml
This tutorial also assumes that you have at least some knowledge of HTML. This is necessary because if I have to explain all the HTML tags as well, this tutorial will end up being tediously long.
You'll probably need a bit of programming background, or at the very least, an aptitude for computer programming. Note that being able to code in HTML does not count, since HTML is not a programming language. Unlike the majority of the other articles on thesitewizard.com, this article is not targeted at the absolute newcomer. You really need background in both web design using HTML and a bit of programming skill/aptitude, otherwise this article will be indecipherable. If you are reading this article because you want to create a website, please start with How to Make / Create Your Own Website: The Beginner's A-Z Guide instead.
I will begin with a very rudimentary (but working) PHP script to take input from a feedback form and send it to you in an email message. This type of form is sometimes referred to as a FormMail or Form to Mail script. In later articles, I will develop that script (and others) to include features commonly found in such FormMail scripts.
If you are programming-savvy, you will recognize this as a sort of "Hello World" program, but infinitely more useful!
The first thing we need to do is to write the feedback form itself. Put the following code in the <body> section of an HTML file named, say, feedback.html.
<form method="post" action="sendmail.php"> Email: <input name="email" type="text" /><br /> Message:<br /> <textarea name="message" rows="15" cols="40"> </textarea><br /> <input type="submit" /> </form>
Basically the form asks the visitor for his email address (the field named "email" found in
input name="email" above) and message (the field named "message" found in
textarea name="message"), and presents him with a button which he can click to
submit the contents of the form. When the form is submitted, it is "posted" (see the "method"
attribute of the <form> tag) to a script named "sendmail.php" (also specified in the
Now all that remains is to code "sendmail.php". This is made extremely easy by the facilities available in PHP. Type the following code into a file named "sendmail.php". Do not put anything else into that file, ie, don't put in any other HTML tags or headers, etc.
<?php $email = $_REQUEST['email'] ; $message = $_REQUEST['message'] ; mail( "email@example.com", "Feedback Form Results", $message, "From: $email" ); header( "Location: http://www.example.com/thankyou.html" ); ?>
When the form is submitted to sendmail.php, the contents of the "email" field in the form is put into a PHP variable called $_REQUEST['email']. Likewise the contents of the "message" field is put into the variable $_REQUEST['message'].
If you had named the fields in your form "emailofsender" and "contentsofmessage", then the information submitted in those fields would have been available to your script in the variables $_REQUEST['emailofsender'] and $_REQUEST['contentsofmessage'] respectively. I think you get the idea.
The first thing we do in our PHP script is to make the information that is submitted easily accessible to the rest of the program.
Firstly, we made a copy of the contents of $_REQUEST['email'] in a variable we call $email. This was done in the line
Note that we don't really have to call this new variable $email. We could have called it $thingamajig if we wished, but it makes sense to name a variable with some meaningful name.
Likewise, in the next line, we made a copy of $_REQUEST['message'] in a variable $message. That is, we assigned the value of $_REQUEST['message'] to $message.
Again, we could have named the new variable anything we wanted — but it's easier for us to understand the program if the variable name reflects what it does.
The real workhorse of this script is in the line beginning with "mail".
Notice that, like many other programming languages, strings (sequences of characters) are enclosed in double quotes, such as "Feedback Form Results".
$message can be used as-is. Note also that you can also
interpolate (introduce) the contents of the variable
"From: $email", so that if your
You can also use single quotes (such as those in
'Hi there') to quote strings, but when
you do so, the variables included are not expanded. This is useful if, for some reason, you
really want to pass the string
'From: $email' to mail without PHP translating that to
Finally, it is appropriate to thank the visitor for his message. This is done with the line
This line causes PHP to send an HTTP header back to the visitor's browser telling it to load the URL "http://www.example.com/thankyou.html". The "header" function allows us to send any HTTP header to the browser.
You will of course have to create such a file called "thankyou.html" with some sort of message to thank your visitor for his efforts, otherwise your visitor will be greeted with an unfriendly "404 File Not Found" error after he sends his message. You should also replace the URLs and email addresses with the correct ones if you want to use that script on your site.
By the way, the script has to be enclosed within the "
<?php" and "
?>" tags because the
PHP processor treats all input as HTML code unless otherwise specified. On most systems,
you can simply use "
<?" and "
?>" as the opening and closing tags to get the script
to work, however if you want to be sure that your script will work on all systems, you should use the full
<?php" form for the opening tag.
Easy wasn't it? In just a few lines, you've written your first PHP script. And it's not some trivial and useless script — it is actually a working, usable program.
However, before you put the script "live" on the Internet, you should check out the following additional tutorials:
In How to Add Form Validation, Disable Browser Caching and Embed HTML with PHP, you will develop the script so that your visitor's input is checked to catch instances where someone accidentally clicks the "Submit" button before they fill in their email address. You will also learn how to integrate both the form and the script into a single "feedback.php" file if you wish.
The article How to Prevent Email Injection in Your PHP Form to Mail Scripts deals with the security aspects of putting a PHP form to mail script "live" on the Internet, where spammers can abuse it and hijack it to send spam to others.
If, after reading this article, you decide that it's too much of a hassle to write your own script, you may want to get one of those free PHP scripts written by others to do the job for you instead. Those looking for a feedback form script can simply go to my Free Feedback Form Wizard to generate your own customised feedback form script. For other types of scripts, please see the list on thefreecountry.com's Free PHP Scripts page.
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