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  1. <?php
  2.  
  3. /**
  4.  * author     : forecho <caizhenghai@gmail.com>
  5.  * createTime : 2018/1/23 18:35
  6.  * description:
  7.  */
  8. /**
  9.  * 区块
  10.  * Class Block
  11.  */
  12. class Block
  13. {
  14.     /**
  15.      * @var string 时间
  16.      */
  17.     public $timestamp;
  18.     /**
  19.      * @var integer 索引
  20.      */
  21.     public $index;
  22.     /**
  23.      * @var string 数据
  24.      */
  25.     public $data;
  26.     /**
  27.      * @var string 上一个哈希值
  28.      */
  29.     public $prevHash;
  30.     /**
  31.      * @var string 当前哈希
  32.      */
  33.     public $hash;
  34.     public function __construct($index, $timestamp, $data, $prevHash = '')
  35.     {
  36.         $this->index = $index;
  37.         $this->timestamp = $timestamp;
  38.         $this->data = $data;
  39.         $this->prevHash = $prevHash;
  40.         $this->hash = $this->calculateHash();
  41.     }
  42.     /**
  43.      * 加密算法
  44.      * @return string
  45.      */
  46.     public function calculateHash()
  47.     {
  48.         return hash('sha256', $this->index . $this->prevHash . $this->timestamp . json_encode($this->data));
  49.     }
  50. }
  51. /**
  52.  * 区块链
  53.  * Class BlockChain
  54.  */
  55. class BlockChain
  56. {
  57.     /**
  58.      * @var Block[]
  59.      */
  60.     public $chain = [];
  61.     public function __construct()
  62.     {
  63.         $this->chain = [$this->createGenesisBlock()];
  64.     }
  65.     /**
  66.      * 创世区块
  67.      * @return Block
  68.      */
  69.     public function createGenesisBlock()
  70.     {
  71.         return new Block(0, '2017-01-23', 'forecho', '0');
  72.     }
  73.     /**
  74.      * 获取最新的区块
  75.      * @return Block|mixed
  76.      */
  77.     public function getLatestBlock()
  78.     {
  79.         return $this->chain[count($this->chain) - 1];
  80.     }
  81.     /**
  82.      * 添加区块
  83.      * @param Block $newBlock
  84.      */
  85.     public function addBlock(Block $newBlock)
  86.     {
  87.         $newBlock->prevHash = $this->getLatestBlock()->hash;
  88.         $newBlock->hash = $newBlock->calculateHash();
  89.         array_push($this->chain, $newBlock);
  90.     }
  91.     /**
  92.      * 验证区块链
  93.      * @return bool
  94.      */
  95.     public function isChainValid()
  96.     {
  97.         for ($i = 1; $i < count($this->chain); $i++) {
  98.             $currentBlock = $this->chain[$i];
  99.             $prevBlock = $this->chain[$i - 1];
  100.             if ($currentBlock->hash !== $currentBlock->calculateHash()) {
  101.                 return false;
  102.             }
  103.             if ($currentBlock->prevHash !== $prevBlock->hash) {
  104.                 return false;
  105.             }
  106.         }
  107.         return true;
  108.     }
  109. }
  110. // test
  111. $blockChain = new BlockChain();
  112. $blockChain->addBlock(new Block(1, '2017-02-23', ['amount' => 1]));
  113. $blockChain->addBlock(new Block(2, '2017-03-23', ['amount' => 3]));
  114. $blockChain->addBlock(new Block(3, '2017-04-23', ['amount' => 20]));
  115. print_r($blockChain);
  116. echo "区块链验证通过吗？" . ($blockChain->isChainValid() ? '通过' : '失败') . PHP_EOL;
  117. $blockChain->chain[1]->data = ['amount' => 2];
  118. $blockChain->chain[1]->hash = $blockChain->chain[1]->calculateHash();
  119. echo "区块链验证通过吗？" . ($blockChain->isChainValid() ? '通过' : '失败') . PHP_EOL;
Success #stdin #stdout 0.02s 23400KB
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BlockChain Object
(
    [chain] => Array
        (
            [0] => Block Object
                (
                    [timestamp] => 2017-01-23
                    [index] => 0
                    [data] => forecho
                    [prevHash] => 0
                    [hash] => 8862e987005e1ebf5f72488a41faba2b00deba05fbed894da742a1dd572dcafe
                )

            [1] => Block Object
                (
                    [timestamp] => 2017-02-23
                    [index] => 1
                    [data] => Array
                        (
                            [amount] => 1
                        )

                    [prevHash] => 8862e987005e1ebf5f72488a41faba2b00deba05fbed894da742a1dd572dcafe
                    [hash] => 19aad00d07e897fb110b15cf3b26a8602a70796c964586f14e78e4c2fee8c14c
                )

            [2] => Block Object
                (
                    [timestamp] => 2017-03-23
                    [index] => 2
                    [data] => Array
                        (
                            [amount] => 3
                        )

                    [prevHash] => 19aad00d07e897fb110b15cf3b26a8602a70796c964586f14e78e4c2fee8c14c
                    [hash] => d4d41ec0d43bde09e8d794dd7ba80f77bed5a693724c7ee382092be8df740c29
                )

            [3] => Block Object
                (
                    [timestamp] => 2017-04-23
                    [index] => 3
                    [data] => Array
                        (
                            [amount] => 20
                        )

                    [prevHash] => d4d41ec0d43bde09e8d794dd7ba80f77bed5a693724c7ee382092be8df740c29
                    [hash] => 90f13918cba4bd89078e058b6d69f3eab00bbd3c71a825c1113efff523006339
                )

        )

)
区块链验证通过吗？通过
区块链验证通过吗？失败
https://ideone.com/CDGIju
language:
PHP (php 7.3.5)
created:
6 years ago
visibility:
public

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