Check if a file was included or loaded

Question

Is there any elegant way to check if a file was included by using include/include_once/require/require_once or if the pag

Answer 1

Working solution:

$target_file = '/home/path/folder/file.php'; // or use __FILE__

if ($x=function($e){return str_replace(array('\\'), '/', $e);}) if(in_array( $x($target_file), array_map( $x ,  get_included_files() ) ) )
{
    exit("Hello, already included !");
}