PHP区块链开发入门：简单链实现 用PHP构建基础区块链的完整教程

Block

<?php

class Block {
    public $index;
    public $timestamp;
    public $data;
    public $previousHash;
    public $hash;

    public function __construct($index, $timestamp, $data, $previousHash = '') {
        $this->index = $index;
        $this->timestamp = $timestamp;
        $this->data = $data;
        $this->previousHash = $previousHash;
        $this->hash = $this->calculateHash();
    }

    public function calculateHash() {
        return hash('sha256', $this->index . $this->timestamp . $this->data . $this->previousHash);
    }
}

index

timestamp

data

previousHash

hash

calculateHash()

Blockchain

<?php

class Blockchain {
    public $chain;

    public function __construct() {
        $this->chain = [$this->createGenesisBlock()];
    }

    public function createGenesisBlock() {
        return new Block(0, time(), "Genesis Block", "0");
    }

    public function getLatestBlock() {
        return end($this->chain);
    }

    public function addBlock(Block $newBlock) {
        $newBlock->previousHash = $this->getLatestBlock()->hash;
        $newBlock->hash = $newBlock->calculateHash();
        $this->chain[] = $newBlock;
    }

    public function isChainValid() {
        for ($i = 1; $i < count($this->chain); $i++){
            $currentBlock = $this->chain[$i];
            $previousBlock = $this->chain[$i - 1];

            if ($currentBlock->hash != $currentBlock->calculateHash()) {
                return false;
            }

            if ($currentBlock->previousHash != $previousBlock->hash) {
                return false;
            }
        }

        return true;
    }
}

Blockchain

chain

createGenesisBlock()

getLatestBlock()

addBlock()

isChainValid()

<?php

$myCoin = new Blockchain();
$myCoin->addBlock(new Block(1, time(), ["amount" => 4]));
$myCoin->addBlock(new Block(2, time(), ["amount" => 10]));

echo "Is chain valid? " . ($myCoin->isChainValid() ? "Yes" : "No") . "\n";
echo "<pre>";
print_r($myCoin);
echo "</pre>";

myCoin

<?php
header('Content-Type: application/json');

require_once 'blockchain.php'; // 包含Blockchain类

$blockchain = new Blockchain();

if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    echo json_encode($blockchain->chain);
} elseif ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $data = json_decode(file_get_contents('php://input'), true);
    $blockchain->addBlock(new Block(count($blockchain->chain), time(), $data));
    echo json_encode(['message' => 'Block added successfully']);
}

fetch('api.php')
  .then(response => response.json())
  .then(data => {
    console.log(data); // 显示区块链数据
    // 在前端界面上渲染数据
  });

// 添加新区块
fetch('api.php', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({ amount: 5 })
})
  .then(response => response.json())
  .then(data => {
    console.log(data); // 显示消息
  });