51行代码实现简单的PHP区块链

今年区块链特别火，我也很火啊。我火什么呢。前几年，公众平台出现，还得花时间去学去看，后来小程序出现，又得花时间精力去学去看。现在比特币、以太坊等去中心化货币带起了区块链的发展。还得学。

没办法，技术改变师姐。不，是改变世界。



前些天看到python写的50行代码实现的简单区块链。今天让我们PHP也实现一下区块链的简单流程。

phper或其他人如有需要可加PHP区块链交流群(370648191/201923866)。

只有一个类、4个方法。可直接运行。

1. <?php
   
2. /**
   
3. * 简单的PHP区块链
   
4. * @author Yoper
   
5. * @PHP技术交流QQ群 370648191
   
6. * @Email chen.yong.peng@foxmail.com
   
7. * @wechat YoperMan
   
8. */
   
9. namespace common\library\block;
   
10. /**
    
11. * 区块结构
    
12. */
    
13. class block{
    
14.     private $index;
    
15.     private $timestamp;
    
16.     private $data;
    
17.     private $previous_hash;
    
18.     private $random_str;
    
19.     private $hash;
    
20.     public function __construct($index,$timestamp,$data,$random_str,$previous_hash)
    
21.     {
    
22.         $this->index=$index;
    
23.         $this->timestamp=$timestamp;
    
24.         $this->data=$data;
    
25.         $this->previous_hash=$previous_hash;
    
26.         $this->random_str=$random_str;
    
27.         $this->hash=$this->hash_block();
    
28.     }
    
29.     public function __get($name){
    
30.         return $this->$name;
    
31.     }
    
32.     private function hash_block(){
    
33.         $str=$this->index.$this->timestamp.$this->data.$this->random_str.$this->previous_hash;
    
34.         return hash("sha256",$str);
    
35.     }
    
36. }
    
37. /**
    
38. * 创世区块
    
39. * @return \common\library\block\block
    
40. */
    
41. function create_genesis_block(){
    
42.     return new \common\library\block\block(0, time(),"第一个区块",0,0);
    
43. }
    
44. /**
    
45. * 挖矿，生成下一个区块
    
46. * 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。
    
47. * @param \common\library\block\block $last_block_obj
    
48. */
    
49. function dig(\common\library\block\block $last_block_obj){
    
50.     $random_str = $last_block_obj->hash.get_random();
    
51.     $index=$last_block_obj->index+1;
    
52.     $timestamp=time();
    
53.     $data='I am block '.$index;
    
54.     $block_obj = new \common\library\block\block($index,$timestamp,$data,$random_str,$last_block_obj->hash);
    
55.    
    
56.     //前一位不是数字
    
57.     if(!is_numeric($block_obj->hash{0})){
    
58.         return false;
    
59.     }
    
60.     //数数字，返回块
    
61.     return $block_obj;
    
62. }
    
63. /**
    
64. * 验证区块
    
65. * 这也是一个复杂的过程，为了简单，我们这里直接返回正确
    
66. * @param array $data
    
67. */
    
68. function verify(\common\library\block\block $last_block_obj){
    
69.     return true;
    
70. }
    
71. /**
    
72. * 生成随机字符串
    
73. * @param int $len
    
74. * @return string
    
75. */
    
76. function get_random($len=32){
    
77.     $str="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    
78.     $key = "";
    
79.     for($i=0;$i<$len;$i++)
    
80.     {
    
81.         $key.= $str{mt_rand(0,32)};//随机数
    
82.     }
    
83.     return $key;
    
84. }
    
85. 
    
86. 
    
87. header("Content-type:text/html;charset=utf-8");
    
88. //生成第一个区块
    
89. $blockchain=[\common\library\block\create_genesis_block()];
    
90. //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
    
91. //我们的链是一个数组，实际生产中应该保存下来
    
92. $previous_block = $blockchain[0];
    
93. for($i=0;$i<=10;$i++){
    
94.     if(!($new_block=dig($previous_block))){
    
95.         continue;
    
96.     }
    
97.     $blockchain[]=$new_block;
    
98.     $previous_block=$new_block;
    
99.    
    
100.     //告诉大家新增了一个区块
     
101.     echo "区块已加入链中.新区块是 : {$new_block->index}<br/>";
     
102.     echo "新区块哈希值是 : {$new_block->hash}<br/>";
     
103.     print_r($new_block);
     
104.     echo "<br/><br/>";
     
105. }

复制代码

以上文件可以直接运行。运行结果如下：



完。

可加以下微信，拉你进微信区块链行业交流群，请发送验证信息"区块链"。

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