md5(3) [php man page]

MD5(3)									 1								    MD5(3)

md5 - Calculate the md5 hash of a string

SYNOPSIS

       string md5 (string  $str, [bool	$raw_output = false])

DESCRIPTION

	Calculates the MD5 hash of $str using the RSA Data Security, Inc. MD5 Message-Digest Algorithm, and returns that hash.

PARAMETERS

	      o $str
		- The string.

	      o $raw_output
		- If the optional $raw_output is set to TRUE, then the md5 digest is instead returned in raw binary format with a length of 16.

RETURN VALUES

	Returns the hash as a 32-character hexadecimal number.

EXAMPLES

       Example #1

	      A md5(3) example

	      <?php
	      $str = 'apple';

	      if (md5($str) === '1f3870be274f6c49b3e31a0c6728957f') {
		  echo "Would you like a green or red apple?";
	      }
	      ?>

NOTES

       Note

	      Secure password hashing

	       It  is  not  recommended  to  use this function to secure passwords, due to the fast nature of this hashing algorithm. See here for
	      details.

SEE ALSO

       md5_file(3), sha1_file(3), crc32(3), sha1(3), hash(3), crypt(3), password_hash(3).

PHP Documentation Group 														    MD5(3)

HASH(3) 								 1								   HASH(3)

hash - Generate a hash value (message digest)

SYNOPSIS

       string hash (string  $algo, string  $data, [bool  $raw_output = false])

DESCRIPTION

PARAMETERS

	      o $algo
		- Name of selected hashing algorithm (e.g. "md5", "sha256", "haval160,4", etc..)

	      o $data
		- Message to be hashed.

	      o $raw_output
		- When set to TRUE, outputs raw binary data.  FALSE outputs lowercase hexits.

RETURN VALUES

	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.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.4.0	|						    |
       |	|						    |
       |	| The tiger  algorithm	now  uses  big-endian  byte |
       |	| ordering. See also example below.		    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      A hash(3) example

	      <?php
	      echo hash('ripemd160', 'The quick brown fox jumped over the lazy dog.');
	      ?>

	      The above example will output:

	      ec457d0a974c48d5685a7efa03d137dc8bbde7e3

       Example #2

	      Calculate pre PHP-5.4 tiger hashes with PHP-5.4 and higher

	      <?php
	      function old_tiger($data = "", $width=192, $rounds = 3) {
		  return substr(
		      implode(
			  array_map(
			      function ($h) {
				  return str_pad(bin2hex(strrev($h)), 16, "0");
			      },
			      str_split(hash("tiger192,$rounds", $data, true), 8)
			  )
		      ),
		      0, 48-(192-$width)/4
		  );
	      }
	      echo hash('tiger192,3', 'a-string'), PHP_EOL;
	      echo old_tiger('a-string'), PHP_EOL;
	      ?>

	      Output of the above example in PHP 5.3:

	      146a7492719b3564094efe7abbd40a7416fd900179d02773
	      64359b7192746a14740ad4bb7afe4e097327d0790190fd16

	      Output of the above example in PHP 5.4:

	      64359b7192746a14740ad4bb7afe4e097327d0790190fd16
	      146a7492719b3564094efe7abbd40a7416fd900179d02773

SEE ALSO

       hash_file(3), hash_hmac(3), hash_init(3), md5(3), sha1(3).

PHP Documentation Group 														   HASH(3)