php - Google app engine direct file upload adds characters to end of file -

i implementing file upload in google app engine php application. when uploading word file following code:

$bucket = "default"; // process files. $filenames = []; foreach ($_files $file) {      $filename = md5(uniqid());      $filename = "gs://".$bucket."/".$filename;     stream_context_set_default(['gs' => [         'content-type' => $file['type'],         'acl' => 'public-read',         'metadata' => [             'filename' => $file['name']         ]     ]]);     move_uploaded_file($_files['uploaded_files']['tmp_name'], $filename);      $filenames[] = $filename; }  $file = $filenames[0]; $fileurl = cloudstoragetools::getpublicurl($file, true); 

when download file using $fileurl word says file corrupted. when run hexdump , vimdiff differences in last part of file. file google app engine has following bytes:

0d 0a 

at end of file. there anyway rid of other loading file content , trim it? thank you.