ハッシュ処理は、どうやらmhash()よりhash()の方が一般的になりそうなので記事を修正。
$password = 'test';
$hash_password = hash('sha256, $password, false);
Array ( [0] => md2 [1] => md4 [2] => md5 [3] => sha1 [4] => sha224 [5] => sha256 [6] => sha384 [7] => sha512 [8] => ripemd128 [9] => ripemd160 [10] => ripemd256 [11] => ripemd320 [12] => whirlpool [13] => tiger128,3 [14] => tiger160,3 [15] => tiger192,3 [16] => tiger128,4 [17] => tiger160,4 [18] => tiger192,4 [19] => snefru [20] => snefru256 [21] => gost [22] => adler32 [23] => crc32 [24] => crc32b [25] => salsa10 [26] => salsa20 [27] => haval128,3 [28] => haval160,3 [29] => haval192,3 [30] => haval224,3 [31] => haval256,3 [32] => haval128,4 [33] => haval160,4 [34] => haval192,4 [35] => haval224,4 [36] => haval256,4 [37] => haval128,5 [38] => haval160,5 [39] => haval192,5 [40] => haval224,5 [41] => haval256,5 )
mhash()は、MD5, SHAl, GOST等の多くのハッシュアルゴリズムをサポート ※ (PHP 5 >= 5.1.2)
MHASH_ADLER32 MHASH_CRC32 MHASH_CRC32B MHASH_GOST MHASH_HAVAL128 MHASH_HAVAL160 MHASH_HAVAL192 MHASH_HAVAL256 MHASH_MD4 MHASH_MD5 MHASH_RIPEMD160 MHASH_SHA1 MHASH_SHA256 MHASH_TIGER MHASH_TIGER128 MHASH_TIGER160
$password = 'test';
$hash = mhash(MHASH_SHA256, $password );
$hash_password = bin2hex($hash);