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                                     sha1

   (PHP 4 >= 4.3.0)
   sha1 -- Calculate the sha1 hash of a string

Description

   string sha1 ( string str [, bool raw_output])

   Calculates the sha1 hash of str using the US Secure Hash Algorithm 1,
   and returns that hash. The hash is a 40-character hexadecimal number.
   If the optional raw_output is set to TRUE, then the sha1 digest is
   instead returned in raw binary format with a length of 20.

     Note: The optional raw_output parameter was added in PHP 5.0.0 and
     defaults to FALSE

   Example 1. A sha1() example
   <?php
   $str = 'apple';

   if (sha1($str) === 'd0be2dc421be4fcd0172e5afceea3970e2f3d940') {
       echo "Would you like a green or red apple?";
       exit;
   }
   ?>

   See also sha1_file(), crc32(), and md5()
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