使用redis乐观锁实现秒杀

header('content-type:text/html;charset=utf-8');
$redis = new Redis();
$result = $redis->open('192.168.1.221', 6379);

//$redis -> set('s_kill_number', 10);

//var_dump($redis -> set( 'b' , 123 ));
//var_dump( $redis -> get('b') );
//var_dump( $result );exit;
//echo "

"; 
  
 echo "页面被访问了" . $redis->incr('ci'). '
'; 
  
 echo '总共抢到了' . $redis->lLen('s_kill') . '
'; 
  
 echo '剩余数量' . $redis->get('s_kill_number'). '
'; 
  
 
  
 $redis -> watch('s_kill_number'); 
  
 
  
 $num_ber = $redis -> get('s_kill_number'); 
  
 // echo $num_ber;die; 
  
 $redis -> multi(); 
  
 
  
 //print_r( $redis->lGetRange('s_kill',0 , $redis ->lLen('s_kill'))); 
  
 //var_dump($num_ber);exit; 
  
 
  
 if ( $num_ber > 0) { 
  
 sleep(2); 
  
 $redis->decr('s_kill_number'); 
  
 $redis->lPush('s_kill', rand(1000, 9999)); 
  
 $redis -> exec(); 
  
 exit('OK'. '
'); 
  
 } else { 
  
 $redis -> exec(); 
  
 exit('抢光了'. '
'); 
  
 
  
 } 
  
 
  

 
  
原链接：http://blog.csdn.net/u013697959/article/details/77477763