a filename problem

[pnxi]

Hi, say I want to store a filename into a variable, and allow the filename change accordingly.
can I use syntax like

  [COLOR=darkred]$filename2="$id.txt";[/COLOR] 
  $contentstring=$subject."|".$name."|".$date."|".$content."|".$filename1."|".$id."|\n";;

  $fp=fopen($filename2, 'a+');
  print("<br><b>test</b>");
  if ($fp) 
  { 
     fwrite($fp,$contentstring);
     fclose($fp);
  }
  else
  {
	 echo ("<br>You cannot open file!");
     exit;
  }

[drawmack]

except from some minor errors yes

$filename2="$id.txt";
$contentstring=$subject."|".$name."|".$date."|".$content."|".$filename1."|".$id."|\n";

$fp=fopen($filename2, 'a+');
print("<br><b>test</b>");
if ($fp)  { 
     fwrite($fp,$contentstring);
     fclose($fp);
} else {
    die ("<br>You cannot open file!");
} //end if