laravel - hashing content of uploaded file in php -

i have upload form , dropzone file uploader beside users can upload .csv files .

i want check whether file new or not. check should contain if contents of file new or not

i store file names in database checking new files, problem when user rename same file , upload again.

my solution hashing content of each file , store beside name in database.

but don't know how hash content of .csv file in php , laravel. i've tried using

hash_file('md5' , request::file('myfilename')->getclientoriginalname()); 

but results in file or stream not found.

what correct way of checking new file regardless of name?

thanks in advance.

calculating hash of file correct way go.

do this:

public function uploadfile() {     // check if upload valid file (example: request()->file('myfilename')->isvalid() )      // calculate hash of file     $filehash = sha1_file( request()->file('myfilename')->path() );      //search file in database , block same file upload (files elequent model)     if( files::where('hash', $filehash)->firstornull() != null) {         abort(400); // abort upload     }      // file , save hash db }