(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
sha1_file — Calculate the sha1 hash of a file
   Calculates the sha1 hash of the file specified by
   filename using the
   » US Secure Hash Algorithm 1,
   and returns that hash. The hash is a 40-character hexadecimal number.
  
filenameThe filename of the file to hash.
binary
       When true, returns the digest in raw binary format with a length of
       20.
      
   Returns a string on success, false otherwise.
  
Example #1 sha1_file() example
<?php
foreach (glob('/examples/*.xml') as $ent)
{
    if (is_dir($ent)) {
        continue;
    }
    echo $ent . ' (SHA1: ' . sha1_file($ent) . ')', PHP_EOL;
}
?>