本文實(shí)例講述了PHP基于redis計(jì)數(shù)器類定義與用法。分享給大家供大家參考，具體如下：
Redis是一個(gè)開源的使用ANSI C語言編寫、支持網(wǎng)絡(luò)、可基于內(nèi)存亦可持久化的日志型、Key-Value數(shù)據(jù)庫(kù)，并提供多種語言的API。
這里使用其incr(自增)，get(獲取)，delete(清除)方法來實(shí)現(xiàn)計(jì)數(shù)器類。
1.Redis計(jì)數(shù)器類代碼及演示實(shí)例
RedisCounter.class.php
<?php
/**
* PHP基于Redis計(jì)數(shù)器類
* Date: 2017-10-28
* Author: fdipzone
* Version: 1.0
*
* Descripton:
* php基于Redis實(shí)現(xiàn)自增計(jì)數(shù)，主要使用redis的incr方法，并發(fā)執(zhí)行時(shí)保證計(jì)數(shù)自增唯一。
*
* Func:
* public incr 執(zhí)行自增計(jì)數(shù)并獲取自增后的數(shù)值
* public get 獲取當(dāng)前計(jì)數(shù)
* public reset 重置計(jì)數(shù)
* private connect 創(chuàng)建redis連接
*/
class RedisCounter{ // class start
private $_config;
private $_redis;
/**
* 初始化
* @param Array $config redis連接設(shè)定
*/
public function __construct($config){
$this->_config = $config;
$this->_redis = $this->connect();
}
/**
* 執(zhí)行自增計(jì)數(shù)并獲取自增后的數(shù)值
* @param String $key 保存計(jì)數(shù)的鍵值
* @param Int $incr 自增數(shù)量，默認(rèn)為1
* @return Int
*/
public function incr($key, $incr=1){
return intval($this->_redis->incr($key, $incr));
}
/**
* 獲取當(dāng)前計(jì)數(shù)
* @param String $key 保存計(jì)數(shù)的健值
* @return Int
*/
public function get($key){
return intval($this->_redis->get($key));
}
/**
* 重置計(jì)數(shù)
* @param String $key 保存計(jì)數(shù)的健值
* @return Int
*/
public function reset($key){
return $this->_redis->delete($key);
}
/**
* 創(chuàng)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(shè)定 $config = array( 'host' => 'localhost', 'port' => 6379, 'index' => 0, 'auth' => '', 'timeout' => 1, 'reserved' => NULL, 'retry_interval' => 100, ); // 創(chuàng)建RedisCounter對(duì)象 $oRedisCounter = new RedisCounter($config); // 定義保存計(jì)數(shù)的健值 $key = 'mycounter'; // 執(zhí)行自增計(jì)數(shù)，獲取當(dāng)前計(jì)數(shù)，重置計(jì)數(shù) 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(fā)調(diào)用計(jì)數(shù)器，檢查計(jì)數(shù)唯一性
測(cè)試代碼如下：
<?php
Require 'RedisCounter.class.php';
// redis連接設(shè)定
$config = array(
'host' => 'localhost',
'port' => 6379,
'index' => 0,
'auth' => '',
'timeout' => 1,
'reserved' => NULL,
'retry_interval' => 100,
);
// 創(chuàng)建RedisCounter對(duì)象
$oRedisCounter = new RedisCounter($config);
// 定義保存計(jì)數(shù)的健值
$key = 'mytestcounter';
// 執(zhí)行自增計(jì)數(shù)并返回自增后的計(jì)數(shù)，記錄入臨時(shí)文件
file_put_contents('/tmp/mytest_result.log', $oRedisCounter->incr($key).PHP_EOL, FILE_APPEND);
?>
測(cè)試并發(fā)執(zhí)行，我們使用ab工具進(jìn)行測(cè)試，設(shè)置執(zhí)行150次，15個(gè)并發(fā)。
ab -c 15 -n 150 http://localhost/test.php
執(zhí)行結(jié)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(jì)數(shù)是否唯一
生成的總計(jì)數(shù) wc -l /tmp/mytest_result.log 150 /tmp/mytest_result.log 生成的唯一計(jì)數(shù) sort -u /tmp/mytest_result.log | wc -l 150
可以看到在并發(fā)調(diào)用的情況下，生成的計(jì)數(shù)也保證唯一。
希望本文所述對(duì)大家PHP程序設(shè)計(jì)有所幫助。
