Question

In CLI mode getenv('HOSTNAME') returns HOSTNAME environment variable correctly, but when called in script returns FALSE.

Why? How can I get the HOSTNAME variable in script?

Answer 1

HOSTNAME is not a CGI environment variable, hence not present in normal PHP scripts.

But you can alternatively use

$hostname = `hostname`;     // exec backticks

Or read the system config file:

$hostname = file_get_contents("/etc/hostname");   // also only U*ix

But most PHP scripts should just use $_SERVER["SERVER_NAME"] or the client-requested $_SERVER["HTTP_HOST"]