php man page for sha1_file

SHA1_FILE(3)								 1							      SHA1_FILE(3)

sha1_file - Calculate the sha1 hash of a file

SYNOPSIS
       string sha1_file (string  $filename, [bool  $raw_output = false])

DESCRIPTION
	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.

PARAMETERS
	      o $filename
		- The filename of the file to hash.

	      o $raw_output
		- When TRUE, returns the digest in raw binary format with a length of 20.

RETURN VALUES
	Returns a string on success, FALSE otherwise.

EXAMPLES
       Example #1

	      sha1_file(3) example

	      <?php
	      foreach(glob('/home/Kalle/myproject/*.php') as $ent)
	      {
		  if(is_dir($ent))
		  {
		      continue;
		  }

		  echo $ent . ' (SHA1: ' . sha1_file($ent) . ')', PHP_EOL;
	      }
	      ?>

CHANGELOG
       +--------+---------------------------------------------------+
       |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/..')		    |
       |	|						    |
       +--------+---------------------------------------------------+
SEE ALSO
       sha1(3), md5_file(3), crc32(3).

PHP Documentation Group 													      SHA1_FILE(3)