Is there any way to know if a php script is running in cli mode?

Question

... or the other way around, is there any way to know if a php script is running inside a web server?

Answer 1

http://www.php.net/manual/en/function.php-sapi-name.php

function is_cli()
{
    return php_sapi_name() === 'cli';
}

Answer 2

Typically, when running in CLI mode, the superglobals $argv and $argc will be set, and many of the typical contents of $_SERVER (e.g. request method) won't be available. In addition, pre-defined console streams such as STDIN, STDOUT and STDERR will be set up.