Title page opening pdf

to view a pdf I use the script

<?php 
  
// Store the file name into variable 
$file = 'filename.pdf'; 
$filename = 'filename.pdf'; 
  
// Header content type 
header('Content-type: application/pdf'); 
  
header('Content-Disposition: inline; filename="' . $filename . '"'); 
  
header('Content-Transfer-Encoding: binary'); 
  
header('Accept-Ranges: bytes'); 
  
// Read the file 
@readfile($file); 
  
?> 

actually when i open the page in the source i have:
< title >Report1 - http://127.0.0.1:8091/scriptcase/app/Mint/pdf/ < /title >
i want only
< title >Report1 - < /title >
how can i set the page title?