Something Useful
Let us do something more useful now. We are going to check what sort of browser the visitor is using. For that, we check the user agent string the browser sends as part of the HTTP request. This information is stored in a variable. Variables always start with a dollar-sign in PHP. The variable we are interested in right now is $_SERVER['HTTP_USER_AGENT'].
Note:
$_SERVER is a special reserved PHP variable that contains all web server information. It is known as a superglobal. See the related manual page on superglobals for more information.
To display this variable, you can simply do:
Example #1 Printing a variable (Array element)
<?php
echo $_SERVER['HTTP_USER_AGENT'];
?>
A sample output of this script may be:
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)
There are many types of variables available in PHP. In the above example we printed an Array element. Arrays can be very useful.
$_SERVER is just one variable that PHP automatically makes available to you. A list can be seen in the Reserved Variables section of the manual or you can get a complete list of them by looking at the output of the phpinfo() function used in the example in the previous section.
You can put multiple PHP statements inside a PHP tag and create little blocks of code that do more than just a single echo. For example, if you want to check for Internet Explorer you can do this:
Example #2 Example using control structures and functions
<?php
if (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== FALSE) {
echo 'You are using Internet Explorer.<br />';
}
?>
A sample output of this script may be:
You are using Internet Explorer.<br />
Here we introduce a couple of new concepts. We have an if statement. If you are familiar with the basic syntax used by the C language, this should look logical to you. Otherwise, you should probably pick up an introductory PHP book and read the first couple of chapters, or read the Language Reference part of the manual.
The second concept we introduced was the strpos()
function call. strpos() is a function built into
PHP which searches a string for another string. In this case we are
looking for 'MSIE' (so-called needle) inside
$_SERVER['HTTP_USER_AGENT'] (so-called haystack). If
the needle is found inside the haystack, the function returns the position
of the needle relative to the start of the haystack. Otherwise, it
returns false. If it does not return false, the if expression evaluates to true
and the code within its is executed. Otherwise, the code is not
run. Feel free to create similar examples,
with if,
else, and other
functions such as strtoupper() and
strlen(). Each related manual page contains examples
too. If you are unsure how to use functions, you will want to read both
the manual page on how to read a
function definition and the section about
PHP functions.
We can take this a step further and show how you can jump in and out of PHP mode even in the middle of a PHP block:
Example #3 Mixing both HTML and PHP modes
<?php
if (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== FALSE) {
?>
<h3>strpos() must have returned non-false</h3>
<p>You are using Internet Explorer</p>
<?php
} else {
?>
<h3>strpos() must have returned false</h3>
<p>You are not using Internet Explorer</p>
<?php
}
?>
A sample output of this script may be:
<h3>strpos() must have returned non-false</h3> <p>You are using Internet Explorer</p>
Instead of using a PHP echo statement to output something, we jumped out
of PHP mode and just sent straight HTML. The important and powerful point
to note here is that the logical flow of the script remains intact. Only
one of the HTML blocks will end up getting sent to the viewer depending on
the result of strpos(). In other words, it depends on
whether the string MSIE was found or not.
