How to fetch a userid

[Bandit8007]

hello people can somebody help out on a lillte issue i have?

im using a own build php script that does read a txt file and tranfers it intoo a sorted php file
but it was build for a blog....

to tell what it does in short is....

ya can manually add releases to page... sofar it works fine but i can't get the userinfo on it

				global $user_identity;
				get_currentuserinfo();

				
				$todaydate = date("m/d/Y");
				
				$riplist .= '{[1] = [[music]],[2] = [['.$user_identity.']],[3] = [['.$todaydate.']],[4] = [['.$artist.' ('.$year.') '.$album.']],},'."\r\n";
			
			}
			
			// append closing bracket to riplist.
			$riplist = $riplist."}";
			
			// we have our riplist, now write to file.
			if ($handle = fopen ($rel_file3, "ab")) {
				// find the file size in bytes and remove one ie trailing bracket on last line
				$truncate = filesize("$rel_file3") - 1;
				// remove trailing bracket.
				ftruncate ($handle, $truncate);
				// write our new rips plus closing bracket }
				if (fwrite($handle, $riplist)) {
					print "<p>Thanks! Your rips were successfully added to the database.</p>";
				} else {
					print "<p>Something went wrong with the writing to DB file process. Please report to admin.</p>";
				}
				fclose($handle);
			} else {
				print "<p>Couldn't open the file for writing!</p>";
			}
		
		} else 
		
			print "<p>You didn't not add owt.</p>";
	
	}

sofar that works fine
but i have trouble to add the user that posted it

 				global $user_identity;
				get_currentuserinfo();

				
				$todaydate = date("m/d/Y");
				
				$riplist .= '{[1] = [[music]],[2] = [['.$user_identity.']],[3] = [['.$todaydate.']],[4] = [['.$artist.' ('.$year.') '.$album.']],},'."\r\n";
			
			}

the last coded part us the issue

cause im getting the error:

Fatal error: Call to undefined function fetch_userinfo() in /var/www/Forum/database/releases.php on line 324

line 324 is empty

322> global $user_identity;
323> get_currentuserinfo();
324> empty

any idea how to fix?
thnx