PHP は Redis ロックを使用して同時アクセスを制限するクラスの例

<?php
/**
 * Redis锁操作类
 * Date:  2016-06-30
 * Author: fdipzone
 * Ver:  1.0
 *
 * Func:
 * public lock  获取锁
 * public unlock 释放锁
 * private connect 连接
 */
class RedisLock { // class start
 
  private $_config;
  private $_redis;
 
  /**
   * 初始化
   * @param Array $config redis连接设定
   */
  public function __construct($config=array()){
    $this->_config = $config;
    $this->_redis = $this->connect();
  }
 
  /**
   * 获取锁
   * @param String $key  锁标识
   * @param Int   $expire 锁过期时间
   * @return Boolean
   */
  public function lock($key, $expire=5){
    $is_lock = $this->_redis->setnx($key, time()+$expire);
 
    // 不能获取锁
    if(!$is_lock){
 
      // 判断锁是否过期
      $lock_time = $this->_redis->get($key);
 
      // 锁已过期，删除锁，重新获取
      if(time()>$lock_time){
        $this->unlock($key);
        $is_lock = $this->_redis->setnx($key, time()+$expire);
      }
    }
 
    return $is_lock? true : false;
  }
 
  /**
   * 释放锁
   * @param String $key 锁标识
   * @return Boolean
   */
  public function unlock($key){
    return $this->_redis->del($key);
  }
 
  /**
   * 创建redis连接
   * @return Link
   */
  private function connect(){
    try{
      $redis = new Redis();
      $redis->connect($this->_config[&#39;host&#39;],$this->_config[&#39;port&#39;],$this->_config[&#39;timeout&#39;],$this->_config[&#39;reserved&#39;],$this->_config[&#39;retry_interval&#39;]);
      if(empty($this->_config[&#39;auth&#39;])){
        $redis->auth($this->_config[&#39;auth&#39;]);
      }
      $redis->select($this->_config[&#39;index&#39;]);
    }catch(RedisException $e){
      throw new Exception($e->getMessage());
      return false;
    }
    return $redis;
  }
 
} // class end
 
?>

<?php
require &#39;RedisLock.class.php&#39;;
 
$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redislock对象
$oRedisLock = new RedisLock($config);
 
// 定义锁标识
$key = &#39;mylock&#39;;
 
// 获取锁
$is_lock = $oRedisLock->lock($key, 10);
 
if($is_lock){
  echo &#39;get lock success<br>&#39;;
  echo &#39;do sth..<br>&#39;;
  sleep(5);
  echo &#39;success<br>&#39;;
  $oRedisLock->unlock($key);
 
// 获取锁失败
}else{
  echo &#39;request too frequently<br>&#39;;
}
 
?>