PHP

php sha256

echo hash('sha256', $_POST['ppasscode']);

php create Hmac sha256

$signature = hash_hmac('sha256', "some string", "some secret");

sha256 php

echo hash('sha256', 'some string');

sha256 in php

$hash = hash('sha256', 'hello, world!');
var_dump($hash);

sha256 php

//cantidad de caracteres por cada HAS

ALGORITMO  | CANT | ENCRIPTACION
-----------|------|------------------------------------------------------
md2        |   32 | a9046c73e00331af68917d3804f70655                  
md4        |   32 | 866437cb7a794bce2b727acc0362ee27
md5        |   32 | 5d41402abc4b2a76b9719d911017c592
sha1       |   40 | aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d
sha256     |   64 | 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e730
sha384     |   96 | 59e1748777448c69de6b800d7a33bbfb9ff1b463e44354c3553
sha512     |   128| 9b71d224bd62f3785d96d46ad3ea3d73319bfbc2890caadae2d
ripemd128  |   32 | 789d569f08ed7055e94b4289a4195012
ripemd160  |   40 | 108f07b8382412612c048d07d13f814118445acd
ripemd256  |   64 | cc1d2594aece0a064b7aed75a57283d9490fd5705ed3d66bf9a
ripemd320  |   80 | eb0cf45114c56a8421fbcb33430fa22e0cd607560a88bbe14ce
whirlpool  |   128| 0a25f55d7308eca6b9567a7ed3bd1b46327f0f1ffdc804dd8bb
tiger128,3 |   32 | a78862336f7ffd2c8a3874f89b1b74f2
tiger160,3 |   40 | a78862336f7ffd2c8a3874f89b1b74f2f27bdbca
tiger192,3 |   48 | a78862336f7ffd2c8a3874f89b1b74f2f27bdbca39660254
tiger128,4 |   32 | 1c2a939f230ee5e828f5d0eae5947135
tiger160,4 |   40 | 1c2a939f230ee5e828f5d0eae5947135741cd0ae
tiger192,4 |   48 | 1c2a939f230ee5e828f5d0eae5947135741cd0aefeeb2adc
snefru     |   64 | 7c5f22b1a92d9470efea37ec6ed00b2357a4ce3c41aa6e28e3b
gost       |   64 | a7eb5d08ddf2363f1ea0317a803fcef81d33863c8b2f9f6d7d1
adler32    |    8 | 062c0215
crc32      |    8 | 3d653119
crc32b     |    8 | 3610a686
haval128,3 |   32 | 85c3e4fac0ba4d85519978fdc3d1d9be
haval160,3 |   40 | 0e53b29ad41cea507a343cdd8b62106864f6b3fe
haval192,3 |   48 | bfaf81218bbb8ee51b600f5088c4b8601558ff56e2de1c4f
haval224,3 |   56 | 92d0e3354be5d525616f217660e0f860b5d472a9cb99d6766be
haval256,3 |   64 | 26718e4fb05595cb8703a672a8ae91eea071cac5e7426173d4c
haval128,4 |   32 | fe10754e0b31d69d4ece9c7a46e044e5
haval160,4 |   40 | b9afd44b015f8afce44e4e02d8b908ed857afbd1
haval192,4 |   48 | ae73833a09e84691d0214f360ee5027396f12599e3618118
haval224,4 |   56 | e1ad67dc7a5901496b15dab92c2715de4b120af2baf661ecd92
haval256,4 |   64 | 2d39577df3a6a63168826b2a10f07a65a676f5776a0772e0a87
haval128,5 |   32 | d20e920d5be9d9d34855accb501d1987
haval160,5 |   40 | dac5e2024bfea142e53d1422b90c9ee2c8187cc6
haval192,5 |   48 | bbb99b1e989ec3174019b20792fd92dd67175c2ff6ce5965
haval224,5 |   56 | aa6551d75e33a9c5cd4141e9a068b1fc7b6d847f85c3ab16295
haval256,5 |   64 | 348298791817d5088a6de6c1b6364756d404a50bd64e645035f

sha256 encryption in php

Could this be a typo? (two Ps in ppasscode, intended?)

$_POST['ppasscode'];
I would make sure and do:

print_r($_POST);
and make sure the data is accurate there, and then echo out what it should look like:

echo hash('sha256', $_POST['ppasscode']);
Compare this output to what you have in the database (manually). By doing this you're exploring your possible points of failure:

Getting password from form
hashing the password
stored password
comparison of the two.