Detailed explanation of PHP-based redis counter class

<?php/**

 * PHP基于Redis计数器类

 * Date:    2017-10-28

 * Author:  fdipzone

 * Version: 1.0

 *

 * Descripton:

 * php基于Redis实现自增计数，主要使用redis的incr方法，并发执行时保证计数自增唯一。

 *

 * Func:

 * public  incr    执行自增计数并获取自增后的数值

 * public  get     获取当前计数

 * public  reset   重置计数

 * private connect 创建redis连接

 */class RedisCounter{ // class start

    private $_config;    private $_redis;    /**

     * 初始化

     * @param Array $config redis连接设定

     */

    public function __construct($config){

        $this->_config = $config;

        $this->_redis = $this->connect();

    }    /**

     * 执行自增计数并获取自增后的数值

     * @param  String $key  保存计数的键值

     * @param  Int    $incr 自增数量，默认为1

     * @return Int

     */

    public function incr($key, $incr=1){        return intval($this->_redis->incr($key, $incr));

    }    /**

     * 获取当前计数

     * @param  String $key 保存计数的健值

     * @return Int

     */

    public function get($key){        return intval($this->_redis->get($key));

    }    /**

     * 重置计数

     * @param  String  $key 保存计数的健值

     * @return Int

     */

    public function reset($key){        return $this->_redis->delete($key);

    }    /**

     * 创建redis连接

     * @return Link

     */

    private function connect(){        try{

            $redis = new Redis();

            $redis->connect($this->_config['host'],$this->_config['port'],$this->_config['timeout'],$this->_config['reserved'],$this->_config['retry_interval']);            if(empty($this->_config['auth'])){

                $redis->auth($this->_config['auth']);

            }

            $redis->select($this->_config['index']);

        }catch(RedisException $e){            throw new Exception($e->getMessage());            return false;

        }        return $redis;

    }

} // class end?>

<?phpRequire &#39;RedisCounter.class.php&#39;;// redis连接设定$config = array(    &#39;host&#39; => &#39;localhost&#39;,    &#39;port&#39; => 6379,    &#39;index&#39; => 0,    &#39;auth&#39; => &#39;&#39;,    &#39;timeout&#39; => 1,    &#39;reserved&#39; => NULL,    &#39;retry_interval&#39; => 100,

);// 创建RedisCounter对象$oRedisCounter = new RedisCounter($config);// 定义保存计数的健值$key = 'mycounter';// 执行自增计数，获取当前计数，重置计数echo $oRedisCounter->get($key).PHP_EOL; // 0echo $oRedisCounter->incr($key).PHP_EOL; // 1echo $oRedisCounter->incr($key, 10).PHP_EOL; // 11echo $oRedisCounter->reset($key).PHP_EOL; // 1echo $oRedisCounter->get($key).PHP_EOL; // 0 ?>

0

1

11

1

0

<?phpRequire &#39;RedisCounter.class.php&#39;;// redis连接设定$config = array(    &#39;host&#39; => &#39;localhost&#39;,    &#39;port&#39; => 6379,    &#39;index&#39; => 0,    &#39;auth&#39; => &#39;&#39;,    &#39;timeout&#39; => 1,    &#39;reserved&#39; => NULL,    &#39;retry_interval&#39; => 100,

);// 创建RedisCounter对象$oRedisCounter = new RedisCounter($config);// 定义保存计数的健值$key = 'mytestcounter';// 执行自增计数并返回自增后的计数，记录入临时文件file_put_contents('/tmp/mytest_result.log', $oRedisCounter->incr($key).PHP_EOL, FILE_APPEND);?>

ab -c 15 -n 150 http://localhost/test.php

ab -c 15 -n 150 http://localhost/test.php

This is ApacheBench, Version 2.3 <$Revision: 1554214 $>

Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/

Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking home.rabbit.km.com (be patient).....done

Server Software:        nginx/1.6.3Server Hostname:        localhost

Server Port:            80Document Path:          /test.php

Document Length:        0 bytesConcurrency Level:      15Time taken for tests:   0.173 secondsComplete requests:      150Failed requests:        0Total transferred:      24150 bytesHTML transferred:       0 bytesRequests per second:    864.86 [#/sec] (mean)Time per request:       17.344 [ms] (mean)

Time per request:       1.156 [ms] (mean, across all concurrent requests)

Transfer rate:          135.98 [Kbytes/sec] received

Connection Times (ms)              min  mean[+/-sd] median   maxConnect:        0    0   0.2      0       1Processing:     3   16   3.2     16      23Waiting:        3   16   3.2     16      23Total:          4   16   3.1     17      23Percentage of the requests served within a certain time (ms)  50%     17

  66%     18

  75%     18

  80%     19

  90%     20

  95%     21

  98%     22

  99%     22

 100%     23 (longest request)

生成的总计数

wc -l /tmp/mytest_result.log

     150 /tmp/mytest_result.log生成的唯一计数

sort -u /tmp/mytest_result.log | wc -l

     150