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/home/liyazhu/public_html/assignment3/predefined.php.
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Apache.
PHP has many predefined variables.These allow you to quickly glean important and frequently used information.
Let's look at variable $_SERVER, for example,
$_SERVER['SCRIPT_FILENAME'] variable stores the full path and name of the script being run
$_SERVER['HTTP_USER_AGENT'] variable represents the browser and operating system of the user accessing the script.
$_SERVER['SERVER_SOFTWARE'] variable represents the web application on the server that's running PHP (e.g. Apache, )