(PHP 4 >= 4.3.0, PHP 5)
sha1_file — Calculate the sha1 hash of a file
$filename
   [, bool $raw_output = false
  ] )
   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.
raw_output
       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('/home/Kalle/myproject/*.php') as $ent)
{
    if(is_dir($ent))
    {
        continue;
    }
    echo $ent . ' (SHA1: ' . sha1_file($ent) . ')', PHP_EOL;
}
?>
| Version | Description | 
|---|---|
| 5.1.0 | Changed the function to use the streams API. It means that you can use it with wrappers, like sha1_file('http://example.com/..') |