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jeudi 8 janvier 2009

4.Your first PHP-enabled page


Your first PHP-enabled page


Create a file named hello.php and put it in your web
server's root directory (DOCUMENT_ROOT) with the
following content:








????? 2-1. Our first PHP script: hello.php





<html>
<head>
<title>PHP
Test</title>
</head>
<body>
<?php echo
'<p>Hello World</p>'; ?>
</body>
</html>

Use your browser to access the file with your web server's URL, ending with
the "/hello.php" file reference. When developing locally this URL will be
something like http://localhost/hello.php or http://127.0.0.1/hello.php but this depends on the web
server's configuration. If everything is configured correctly, this file will be
parsed by PHP and the following output will be sent to your browser: 





<html>
<head>
 <title>PHP Test</title>
</head>
<body>
<p>Hello World</p>
</body>
</html>

This program is extremely simple and you really did not need to use PHP to
create a page like this. All it does is display: Hello
World using the PHP echo() statement. Note that the file does not need to be executable or
special in any way. The server finds out that this file needs to be interpreted
by PHP because you used the ".php" extension, which the server is configured to
pass on to PHP. Think of this as a normal HTML file which happens to have a set
of special tags available to you that do a lot of interesting things.


If you tried this example and it did not output anything, it prompted for
download, or you see the whole file as text, chances are that the server you are
on does not have PHP enabled, or is not configured properly. Ask your
administrator to enable it for you using the Installation chapter of the manual. If you are
developing locally, also read the installation chapter to make sure everything
is configured properly. Make sure that you access the file via http with the
server providing you the output. If you just call up the file from your file
system, then it will not be parsed by PHP. If the problems persist anyway, do
not hesitate to use one of the many PHP support options.


The point of the example is to show the special PHP tag format. In this
example we used <?php to indicate the start of a PHP
tag. Then we put the PHP statement and left PHP mode by adding the closing tag,
?>. You may jump in and out of PHP mode in an HTML
file like this anywhere you want. For more details, read the manual section on
the basic PHP syntax.




A Note on Text Editors: There are many text editors and Integrated
Development Environments (IDEs) that you can use to create, edit and manage PHP
files. A partial list of these tools is maintained at PHP
Editors List. If you wish to recommend an editor, please visit the above
page and ask the page maintainer to add the editor to the list. Having an editor
with syntax highlighting can be helpful.

A Note on Word Processors: Word processors such as StarOffice Writer,
Microsoft Word and Abiword are not optimal for editing PHP files. If you wish to
use one for this test script, you must ensure that you save the file as plain text or PHP will not be able
to read and execute the script.

A Note on Windows Notepad: If you are writing your PHP scripts using
Windows Notepad, you will need to ensure that your files are saved with the .php
extension. (Notepad adds a .txt extension to files automatically unless you take
one of the following steps to prevent it.) When you save the file and are
prompted to provide a name for the file, place the filename in quotes (i.e. "hello.php"). Alternatively, you can click on the 'Text
Documents' drop-down menu in the 'Save' dialog box and change the setting to
"All Files". You can then enter your filename without quotes.


Now that you have successfully created a working PHP script, it is time to
create the most famous PHP script! Make a call to the phpinfo() function and
you will see a lot of useful information about your system and setup such as
available predefined variables,
loaded PHP modules, and configuration settings.
Take some time and review this important information.








????? 2-2. Get system information from PHP





<?php
phpinfo(); ?>

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