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PHP中怎么利用redis定義一個計數器類,相信很多沒有經驗的人對此束手無策,為此本文總結了問題出現的原因和解決方法,通過這篇文章希望你能解決這個問題。
1.Redis計數器類代碼及演示實例
RedisCounter.class.php
<?php /** * Descripton: * php基于Redis實現自增計數,主要使用redis的incr方法,并發執行時保證計數自增唯一。 * * Func: * public incr 執行自增計數并獲取自增后的數值 * public get 獲取當前計數 * public reset 重置計數 * private connect 創建redis連接 */ class RedisCounter{ // class start private $_config; private $_redis; /** * 初始化 * @param Array $config redis連接設定 */ public function __construct($config){ $this->_config = $config; $this->_redis = $this->connect(); } /** * 執行自增計數并獲取自增后的數值 * @param String $key 保存計數的鍵值 * @param Int $incr 自增數量,默認為1 * @return Int */ public function incr($key, $incr=1){ return intval($this->_redis->incr($key, $incr)); } /** * 獲取當前計數 * @param String $key 保存計數的健值 * @return Int */ public function get($key){ return intval($this->_redis->get($key)); } /** * 重置計數 * @param String $key 保存計數的健值 * @return Int */ public function reset($key){ return $this->_redis->delete($key); } /** * 創建redis連接 * @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 ?>
demo.php
<?php Require 'RedisCounter.class.php'; // redis連接設定 $config = array( 'host' => 'localhost', 'port' => 6379, 'index' => 0, 'auth' => '', 'timeout' => 1, 'reserved' => NULL, 'retry_interval' => 100, ); // 創建RedisCounter對象 $oRedisCounter = new RedisCounter($config); // 定義保存計數的健值 $key = 'mycounter'; // 執行自增計數,獲取當前計數,重置計數 echo $oRedisCounter->get($key).PHP_EOL; // 0 echo $oRedisCounter->incr($key).PHP_EOL; // 1 echo $oRedisCounter->incr($key, 10).PHP_EOL; // 11 echo $oRedisCounter->reset($key).PHP_EOL; // 1 echo $oRedisCounter->get($key).PHP_EOL; // 0 ?>
輸出:
0 1 11 1 0
2.并發調用計數器,檢查計數唯一性
測試代碼如下:
<?php Require 'RedisCounter.class.php'; // redis連接設定 $config = array( 'host' => 'localhost', 'port' => 6379, 'index' => 0, 'auth' => '', 'timeout' => 1, 'reserved' => NULL, 'retry_interval' => 100, ); // 創建RedisCounter對象 $oRedisCounter = new RedisCounter($config); // 定義保存計數的健值 $key = 'mytestcounter'; // 執行自增計數并返回自增后的計數,記錄入臨時文件 file_put_contents('/tmp/mytest_result.log', $oRedisCounter->incr($key).PHP_EOL, FILE_APPEND); ?>
測試并發執行,我們使用ab工具進行測試,設置執行150次,15個并發。
ab -c 15 -n 150 http://localhost/test.php
執行結果:
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/1.6.3 Server Hostname: localhost Server Port: 80 Document Path: /test.php Document Length: 0 bytes Concurrency Level: 15 Time taken for tests: 0.173 seconds Complete requests: 150 Failed requests: 0 Total transferred: 24150 bytes HTML transferred: 0 bytes Requests 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 max Connect: 0 0 0.2 0 1 Processing: 3 16 3.2 16 23 Waiting: 3 16 3.2 16 23 Total: 4 16 3.1 17 23 Percentage 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)
檢查計數是否唯一
生成的總計數 wc -l /tmp/mytest_result.log 150 /tmp/mytest_result.log 生成的唯一計數 sort -u /tmp/mytest_result.log | wc -l 150
看完上述內容,你們掌握PHP中怎么利用redis定義一個計數器類的方法了嗎?如果還想學到更多技能或想了解更多相關內容,歡迎關注億速云行業資訊頻道,感謝各位的閱讀!
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