php 区块链算法_51行代码实现简单的PHP区块链

/**

* 简单的PHP区块链

* @author Yoper

* @PHP技术交流QQ群 370648191

* @Email chen.yong.peng@foxmail.com

* @wechat YoperMan

*/

namespace commonlibraryblock;

/**

* 区块结构

*/

class block{

private $index;

private $timestamp;

private $data;

private $previous_hash;

private $random_str;

private $hash;

public function __construct($index,$timestamp,$data,$random_str,$previous_hash)

{

$this->index=$index;

$this->timestamp=$timestamp;

$this->data=$data;

$this->previous_hash=$previous_hash;

$this->random_str=$random_str;

$this->hash=$this->hash_block();

}

public function __get($name){

return $this->$name;

}

private function hash_block(){

$str=$this->index.$this->timestamp.$this->data.$this->random_str.$this->previous_hash;

return hash("sha256",$str);

}

}

/**

* 创世区块

* @return commonlibraryblockblock

*/

function create_genesis_block(){

return new commonlibraryblockblock(0, time(),"第一个区块",0,0);

}

/**

* 挖矿，生成下一个区块

* 这应该是一个复杂的算法，但为了简单，我们这里挖到前1位是数字就挖矿成功。

* @param commonlibraryblockblock $last_block_obj

* @return bool|block

*/

function dig(commonlibraryblockblock $last_block_obj){

$random_str = $last_block_obj->hash.get_random();

$index=$last_block_obj->index+1;

$timestamp=time();

$data='I am block '.$index;

$block_obj = new commonlibraryblockblock($index,$timestamp,$data,$random_str,$last_block_obj->hash);

//前一位不是数字

if(!is_numeric($block_obj->hash{2})){

return false;

}

//数数字，返回块

return $block_obj;

}

/**

* 验证区块

* 这也是一个复杂的过程，为了简单，我们这里直接返回正确

* @param array $data

* @return bool

*/

function verify(commonlibraryblockblock $last_block_obj){

return true;

}

/**

* 生成随机字符串

* @param int $len

* @return string

*/

function get_random($len=32){

$str="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

$key = "";

for($i=0;$i

{

$key.= $str{mt_rand(0,32)};//随机数

}

return $key;

}

header("Content-type:text/html;charset=utf-8");

//生成第一个区块

$blockchain=[commonlibraryblockcreate_genesis_block()];

print_r($blockchain);

//模拟生成其他区块,我们直接循环生成。实际中，还需要跟踪互联网上多台机器上链的变化,像比特币会有工作量证明等算法，达到条件了才生成区块等

//我们的链是一个数组，实际生产中应该保存下来

$previous_block = $blockchain[0];

for($i=0;$i<=1;$i++){

if(!($new_block=dig($previous_block))){

continue;

}

$blockchain[]=$new_block;

$previous_block=$new_block;

//告诉大家新增了一个区块

echo "区块已加入链中.新区块是 : {$new_block->index}
";

echo "新区块哈希值是 : {$new_block->hash}
";

print_r($new_block);

echo "
";

}