Programming PHP

The following code shows how to test for a Windows platform prior to setting an
include path:
Handling Paths Across Platforms
PHP understands the use of either backward or forward slashes on Windows platforms,
and can even handle paths that mix the use of the two slashes. As of Version
4.0.7, PHP will also recognize the forward slash when accessing Windows UNC
paths (i.e., //machine_name/path/to/file). For example, these two lines are equivalent:
$fh = fopen('c:/tom/schedule.txt', 'r');
$fh = fopen('c:\\tom\\schedule.txt', 'r');
The Environment
PHP defines the constant array $HTTP_ENV_VARS, which contains the HTTP environment
information. Additionally, PHP provides the getenv( ) function to obtain the
same information. For example: