(PHP 5 >= 5.1.2, PECL hash >= 1.1)
hash_final — Finalize an incremental hash and return resulting digest
$context
   [, bool $raw_output = false
  ] )
contextHashing context returned by hash_init().
raw_output
       When set to TRUE, outputs raw binary data.
       FALSE outputs lowercase hexits.
      
   Returns a string containing the calculated message digest as lowercase hexits
   unless raw_output is set to true in which case the raw
   binary representation of the message digest is returned.
  
Example #1 hash_final() example
<?php
$ctx = hash_init('sha1');
hash_update($ctx, 'The quick brown fox jumped over the lazy dog.');
echo hash_final($ctx);
?>
The above example will output:
c0854fb9fb03c41cce3802cb0d220529e6eef94e