hash
hash
(PHP 5 >= 5.1.2, PHP 7, PECL hash >= 1.1)
hash — Generate a hash value (message digest)
Description
string hash ( string $algo , string $data [, bool $raw_output = false ] )
Parameters
-
algo -
Name of selected hashing algorithm (e.g. "md5", "sha256", "haval160,4", etc..)
-
data -
Message to be hashed.
-
raw_output -
When set to
TRUE, outputs raw binary data.FALSEoutputs lowercase hexits.
Return Values
Returns a string containing the calculated message digest as lowercase hexits unless raw_output is set to true in which case the raw binary representation of the message digest is returned.
Changelog
| Version | Description |
|---|---|
| 5.4.0 | The tiger algorithm now uses big-endian byte ordering. See also example below. |
Examples
Example #1 A hash() example
<?php
echo hash('ripemd160', 'The quick brown fox jumped over the lazy dog.');
?> The above example will output:
ec457d0a974c48d5685a7efa03d137dc8bbde7e3
Example #2 Calculate pre PHP-5.4 tiger hashes with PHP-5.4 and higher
<?php
function old_tiger($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() - Generate a hash value using the contents of a given file
- hash_hmac() - Generate a keyed hash value using the HMAC method
- hash_init() - Initialize an incremental hashing context
- md5() - Calculate the md5 hash of a string
- sha1() - Calculate the sha1 hash of a string
© 1997–2017 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://secure.php.net/manual/en/function.hash.php
