php hashmap code example

Example 1: php hash

$password = 'test123';

/*
	Always use salt for security reasons.
    I'm using the BCRYPT algorithm use any valid one you like.
*/
$options['salt'] = 'usesomesillystringforsalt';
$options['cost'] = 3;
echo password_hash($password, PASSWORD_BCRYPT, $options)

Example 2: what is the hashmap like in php

class IEqualityComparer {
    public function equals($x, $y) {
        throw new Exception("Not implemented!");
    }
    public function getHashCode($obj) {
        throw new Exception("Not implemented!");
    }
}

class HashMap {
    private $map = array();
    private $comparer;

    public function __construct(IEqualityComparer $keyComparer) {
        $this->comparer = $keyComparer;
    }

    public function has($key) {
        $hash = $this->comparer->getHashCode($key);

        if (!isset($this->map[$hash])) {
            return false;
        }

        foreach ($this->map[$hash] as $item) {
            if ($this->comparer->equals($item['key'], $key)) {
                return true;
            }
        }

        return false;
    }

    public function get($key) {
        $hash = $this->comparer->getHashCode($key);

        if (!isset($this->map[$hash])) {
            return false;
        }

        foreach ($this->map[$hash] as $item) {
            if ($this->comparer->equals($item['key'], $key)) {
                return $item['value'];
            }
        }

        return false;
    }

    public function del($key) {
        $hash = $this->comparer->getHashCode($key);

        if (!isset($this->map[$hash])) {
            return false;
        }

        foreach ($this->map[$hash] as $index => $item) {
            if ($this->comparer->equals($item['key'], $key)) {
                unset($this->map[$hash][$index]);
                if (count($this->map[$hash]) == 0)
                    unset($this->map[$hash]);

                return true;
            }
        }

        return false;
    }

    public function put($key, $value) {
        $hash = $this->comparer->getHashCode($key);

        if (!isset($this->map[$hash])) {
            $this->map[$hash] = array();
        }

        $newItem = array('key' => $key, 'value' => $value);        

        foreach ($this->map[$hash] as $index => $item) {
            if ($this->comparer->equals($item['key'], $key)) {
                $this->map[$hash][$index] = $newItem;
                return;
            }
        }

        $this->map[$hash][] = $newItem;
    }
}

Example 3: hash php

I was interested how "long" each hash is, so I did:



<?php

$data = "password";



foreach (hash_algos() as $v) {

        $r = hash($v, $data, false);

        printf("%-12s %3d %s\n", $v, strlen($r), $r);

}

?>



which produce (long hashes are cropped)



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