本文实例讲述了PHP基于redis计数器类定义与用法。分享给大家供大家参考,具体如下:
Redis是一个开源的使用ANSI C语言编写、支持网络、可基于内存亦可持久化的日志型、Key-Value数据库,并提供多种语言的API。
这里使用其incr(自增),get(获取),delete(清除)方法来实现计数器类。
1.Redis计数器类代码及演示实例
RedisCounter.class.PHP
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_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
?>
demo.PHP
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'localhost','port' => 6379,'index' => 0,'auth' => '','timeout' => 1,'reserved' => NULL,'retry_interval' => 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; // 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
?>
输出:
PHP;">
0
1
11
1
0
2.并发调用计数器,检查计数唯一性
测试代码如下:
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'localhost',);
// 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($key).PHP_EOL,FILE_APPEND);
?>
测试并发执行,我们使用ab工具进行测试,设置执行150次,15个并发。
PHP;">
ab -c 15 -n 150 http://localhost/test.PHP
执行结果:
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ab -c 15 -n 150 http://localhost/test.PHP
This is ApacheBench,Version 2.3 <$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)
检查计数是否唯一
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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
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希望本文所述对大家PHP程序设计有所帮助。