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PHP4 Installation Overview

Page 10 — Test Your Installation (Windows)

There's one good way to test your install (besides creating a boring little "Hello World" script): use the phpinfo() function. Open a text editor and type this:

<? phpinfo() ?>

That's all! Save this file as phpinfo.php, and put it in Apache's document root (htdocs), then fire up your Web browser and go to "http://localhost/phpinfo.php" where you should see a long page of variables and their values. The phpinfo() function automatically produces this page, which shows you what sorts of things are installed, your environment, your settings, and so on. A lot of configuration options can be controlled by modifying the php.ini file, which you'll learn about in the next section.

TIP: If you only see the literal PHP code, or Apache says "file not found," nine times out of 10 you have one of the following problems:

  • Your phpinfo.php file is really called phpinfo.php.txt and you just can't see the hidden file extension.
  • Your phpinfo.php file is not in the Apache document root.
  • Your ScriptAlias and Action lines in httpd.conf don't match up, or PHP4 isn't installed in the place you think it is.
  • Your AddType lines are incorrect.

In other words, you've probably made a silly little typo, which can be easily fixed.

Otherwise, if your installation blows up in your face, check the PHP Manual or php-windows mailing list archives. Chances are, someone's been through the same problem (but I swear, it's usually one of the silly things listed above, so triple check them before ripping your hair out).

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