check if a file is included

[clive <clive_lists@xxxxxxxxxxxxxxxxxxx>]

I have a file called interceptor.php, which  I would like to make use of 
in two ways

1. either call it directly from the browser or
2. included from another file

I know I could use something like this to see if it was called via a url 
like http://www.site.com/interceptor.php :

if (strstr('interceptor',$__SERVER["REQUEST_URI"])) {
  // url
} else {
  //probably included
}

but I would like to know if there is a neater, cleaner, sparkly way of 
doing this.

Thanks

Clive




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