How would I do this? I need it to write on a blank space around...30 or 50 bytes into the file (list.txt). I can't write to a new file and have it read that file because it doesn't know why there's an if statement. Specifically, it's a simple login script using forms.

EDIT: I have seen things for fseek but that doesn't apply to writing...does it?

You would need to use the fseek method.

   $fd = fopen('file.dat', 'r');
   // file is now open pointer is set to start of file
   fseek($fd, 512); 
   // Pointer is now midway through the file 
   fseek($fd, -256, SEEK_CUR);
   //Pointer is now a 1/4 into the file
   fseek($fd, -1024, SEEK_END);
   //back to start of file
  
 // check out the following  constants too
  SEEK_CUR
  SEEK_END
  SEEK_SET

Ibbo

$byte = fread($fd, 1);

use that after a seek to get the current byte.

Ibbo

I take it I'm doing it wrong but here's the code:

PHP Code:

$filename = "pass.php";
$fd = fopen ($filename, 'r') or die ('$filename not found');
fseek($fd, 512);
fseek($fd, -413, SEEK_CUR);
fread($fd, 1);
fwrite ($fd, $full);
fclose($fd); 


First off your opening the file for reading only 'r'. Change that to 'w' or even 'r+'.

PHP Code:

$full = "now then";
$filename = "pass.php";

$fd = fopen ($filename, 'w') or die ('$filename not found');
fseek($fd, 512);
fseek($fd, -413, SEEK_CUR);
fread($fd, 1);

if(fwrite ($fd, $full) == NULL){
  var_dump("Failed fwrite");
}
fclose($fd); 


open up pass.php and see the text.

Ibbo

Ah, okay. Yea I completely forgot about changing the write mode. Thanks.