# heartbeat\_check\_interval
啟用心跳檢測，此選項表示每隔多久輪循一次，單位為秒。如`heartbeat_check_interval => 60`，表示每`60`秒，遍歷所有連接，如果該連接在`60`秒內，沒有向服務器發送任何數據，此連接將被強制關閉。
`Server`并不會主動向客戶端發送心跳包，而是被動等待客戶端發送心跳。服務器端的`heartbeat_check`僅僅是檢測連接上一次發送數據的時間，如果超過限制，將切斷連接。
* 被心跳檢測切斷的連接依然會觸發`onClose`事件回調
> `heartbeat_check`僅支持`TCP`連接
- 序言
- 入門指引
- 環境依賴
- 編譯安裝
- 編譯參數
- 常見錯誤
- Cygwin
- Linux二進制包
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- 創建TCP服務器
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- 編程須知
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- 進程隔離
- 版本更新記錄
- 4.3.1
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- 1.9.17 支持異步安全重啟特性
- 1.9.14 使用異步客戶端超時機制
- 1.8.0 使用內置Http異步客戶端
- 1.7.16 使用迭代器遍歷Server所有連接
- 1.7.5 在Server中使用swoole_table
- 1.7.5 swoole_client支持sendfile接口
- 1.7.4 SSL隧道加密TCP-Server
- 1.7.4 task進程中使用毫秒定時器
- 1.7.3 固定包頭+包體協議自動分包
- 1.7.3 onTask直接return取代finish函數
- 1.7.2 swoole_process多進程模塊的使用
- 1.7.2 task進程使用消息隊列
- 項目路線圖
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- Connection refused是怎么回事
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- swoole與node.js相比有哪些優勢
- swoole與golang相比有哪些優勢
- pcre.h: No such file or directory
- undefined symbol: __sync_bool_compare_and_swap_4
- 學習Swoole需要掌握哪些基礎知識
- 同步阻塞與異步非阻塞適用場景
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- Swoole 項目起源和名字由來
- '__builtin_saddl_overflow' was not declared in this scope
- Server
- 函數列表
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- Server->task
- Server->taskwait
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- Server->heartbeat
- Server->getLastError
- Server->getSocket
- Server->protect
- Server->confirm
- 屬性列表
- Server::$setting
- Server::$master_pid
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- Server::$worker_id
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- reactor_num
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- daemonize
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- onStart
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- 高級特性
- 改變Worker進程的用戶/組
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- 捕獲Server運行期致命錯誤
- Server內存管理機制
- Server的兩種運行模式介紹
- Server中對象的4層生命周期
- 在worker進程內監聽一個Server端口
- 在php-fpm/apache中使用task功能
- 常見問題
- 為什么不要send完后立即close
- 如何在回調函數中訪問外部的變量
- 是否可以共用1個redis或mysql連接
- 關于onConnect/onReceive/onClose順序
- 4種PHP回調函數風格
- 不同的Server程序實例間如何通信
- 錯誤信息：ERROR (9006)
- eventLoop has already been created. unable to create swoole_server
- 壓力測試
- 并發10萬TCP連接的測試
- PHP7+Swoole/Nginx/Golang性能對比
- 全球Web框架權威性能測試 Techempower Web Framework Benchmarks
- Coroutine
- Coroutine
- Coroutine::set
- Coroutine::stats
- Coroutine::create
- Coroutine::exist
- Coroutine::getCid
- Coroutine::getPcid
- Coroutine::getContext
- Coroutine::defer
- Coroutine::list
- Coroutine::getBackTrace
- Coroutine::yield
- Coroutine::resume
- Coroutine::fread
- Coroutine::fgets
- Coroutine::fwrite
- Coroutine::sleep
- Coroutine::gethostbyname
- Coroutine::getaddrinfo
- Coroutine::exec
- Coroutine::readFile
- Coroutine::writeFile
- Coroutine::statvfs
- Coroutine\Channel
- Coroutine\Channel->__construct
- Coroutine\Channel->push
- Coroutine\Channel->pop
- Coroutine\Channel->stats
- Coroutine\Channel->close
- Coroutine\Channel->length
- Coroutine\Channel->isEmpty
- Coroutine\Channel->isFull
- Coroutine\Channel->$capacity
- Coroutine\Channel->$errCode
- Coroutine\Client
- Coroutine\Client->connect
- Coroutine\Client->send
- Coroutine\Client->recv
- Coroutine\Client->close
- Coroutine\Client->peek
- Coroutine\Http\Client
- 屬性列表
- Coroutine\Http\Client->get
- Coroutine\Http\Client->post
- Coroutine\Http\Client->upgrade
- Coroutine\Http\Client->push
- Coroutine\Http\Client->recv
- Coroutine\Http\Client->addFile
- Coroutine\Http\Client->addData
- Coroutine\Http\Client->download
- Coroutine\Http2\Client
- Coroutine\Http2\Client->__construct
- Coroutine\Http2\Client->set
- Coroutine\Http2\Client->connect
- Coroutine\Http2\Client->send
- Coroutine\Http2\Client->write
- Coroutine\Http2\Client->recv
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- Coroutine\Redis
- Coroutine\Redis::__construct
- Coroutine\Redis::setOptions
- 屬性列表
- 事務模式
- 訂閱模式
- Coroutine\Socket
- Coroutine\Socket::__construct
- Coroutine\Socket->bind
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- Coroutine\Socket->sendAll
- Coroutine\Socket->recv
- Coroutine\Socket->recvAll
- Coroutine\Socket->sendto
- Coroutine\Socket->recvfrom
- Coroutine\Socket->getsockname
- Coroutine\Socket->getpeername
- Coroutine\Socket->close
- Coroutine\MySQL
- 屬性列表
- Coroutine\MySQL->connect
- Coroutine\MySQL->query
- Coroutine\MySQL->prepare
- Coroutine\MySQL->escape
- Coroutine\MySQL->begin
- Coroutine\MySQL->commit
- Coroutine\MySQL->rollback
- Coroutine\MySQL\Statement->execute
- Coroutine\MySQL\Statement->fetch
- Coroutine\MySQL\Statement->fetchAll
- Coroutine\MySQL\Statement->nextResult
- Coroutine\PostgreSQL
- Coroutine\PostgreSQL->connect
- Coroutine\PostgreSQL->query
- Coroutine\PostgreSQL->fetchAll
- Coroutine\PostgreSQL->affectedRows
- Coroutine\PostgreSQL->numRows
- Coroutine\PostgreSQL->fetchObject
- Coroutine\PostgreSQL->fetchAssoc
- Coroutine\PostgreSQL->fetchArray
- Coroutine\PostgreSQL->fetchRow
- Coroutine\PostgreSQL->metaData
- Coroutine\PostgreSQL->prepare
- Server
- 并發調用
- setDefer 機制
- 子協程+通道
- 實現原理
- 協程與線程
- 發送數據協程調度
- 協程內存開銷
- 4.0 協程實現原理
- 協程客戶端超時規則
- 協程執行流程
- 常見問題
- 運行中出現 Fatal error: Maximum function nesting level of '1000' reached, aborting!
- 為什么只能在回調函數中使用協程客戶端
- 支持協程的回調方法列表
- 錯誤信息： XXXX client has already been bound to another coroutine
- Swoole4 協程與 PHP 的 Yield/Generator 協程有什么區別
- Swoole4 協程與 Go 協程有哪些區別
- 編程須知
- 在多個協程間共用同一個協程客戶端
- 禁止使用協程 API 的場景（2.x 版本）
- 使用類靜態變量/全局變量保存上下文
- 退出協程
- 異常處理
- 擴展組件
- MongoDB
- 編程調試
- Runtime
- 文件操作
- 睡眠函數
- 開關選項
- 嚴格模式
- Timer
- swoole_timer_tick
- swoole_timer_after
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- Memory
- Lock
- swoole_lock->__construct
- swoole_lock->lock
- swoole_lock->trylock
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- swoole_lock->lock_read
- swoole_lock->trylock_read
- swoole_lock->lockwait
- Buffer
- swoole_buffer->__construct
- swoole_buffer->append
- swoole_buffer->substr
- swoole_buffer->clear
- swoole_buffer->expand
- swoole_buffer->write
- swoole_buffer->read
- swoole_buffer->recycle
- Table
- Table->__construct
- Table->column
- Table->create
- Table->set
- Table->incr
- Table->decr
- Table->get
- Table->exist
- Table->count
- Table->del
- Atomic
- swoole_atomic->__construct
- swoole_atomic->add
- swoole_atomic->sub
- swoole_atomic->get
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- swoole_atomic->cmpset
- swoole_atomic->wait
- swoole_atomic->wakeup
- mmap
- swoole_mmap::open
- Channel
- Channel->__construct
- Channel->push
- Channel->pop
- Channel->stats
- Serialize
- swoole_serialize::pack
- swoole_serialize::unpack
- Http\Server
- Http\Server
- Http\Server->on
- Http\Server->start
- Http\Request
- Http\Request->$header
- Http\Request->$server
- Http\Request->$get
- Http\Request->$post
- Http\Request->$cookie
- Http\Request->$files
- Http\Request->rawContent
- Http\Request->getData
- Http\Response
- Http\Response->header
- Http\Response->cookie
- Http\Response->status
- Http\Response->gzip
- Http\Response->redirect
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- Http\Response->sendfile
- Http\Response->end
- Http\Response->detach
- Http\Response::create
- 配置選項
- upload_tmp_dir
- http_parse_post
- document_root
- http_compression
- 常見問題
- CURL發送POST請求服務器端超時
- 使用Chrome訪問服務器會產生2次請求
- GET/POST請求的最大尺寸
- WebSocket\Server
- 回調函數
- onHandShake
- onOpen
- onMessage
- 函數列表
- WebSocket\Server->push
- WebSocket\Server->exist
- WebSocket\Server::pack
- WebSocket\Server::unpack
- WebSocket\Server->disconnect
- WebSocket\Server->isEstablished
- 預定義常量
- 常見問題
- 配置選項
- WebSocket\Frame
- Redis\Server
- 方法
- Redis\Server->setHandler
- Redis\Server::format
- 常量
- Process
- Process::__construct
- Process->start
- Process->name
- Process->exec
- Process->write
- Process->read
- Process->setTimeout
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- Process::kill
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- Process::exportSocket
- Process\Pool
- Process\Pool::__construct
- Process\Pool->on
- Process\Pool->listen
- Process\Pool->write
- Process\Pool->start
- Process\Pool->getProcess
- Client
- 方法列表
- swoole_client::__construct
- swoole_client->set
- swoole_client->on
- swoole_client->connect
- swoole_client->isConnected
- swoole_client->getSocket
- swoole_client->getSockName
- swoole_client->getPeerName
- swoole_client->getPeerCert
- swoole_client->send
- swoole_client->sendto
- swoole_client->sendfile
- swoole_client->recv
- swoole_client->close
- swoole_client->sleep
- swoole_client->wakeup
- swoole_client->enableSSL
- 回調函數
- onConnect
- onError
- onReceive
- onClose
- onBufferFull
- onBufferEmpty
- 屬性列表
- swoole_client->errCode
- swoole_client->sock
- swoole_client->reuse
- 并行
- swoole_client_select
- TCP客戶端異步連接
- SWOOLE_KEEP建立TCP長連接
- 常量
- 配置選項
- ssl_verify_peer
- ssl_host_name
- ssl_cafile
- ssl_capath
- package_length_func
- http_proxy_host
- 常見問題
- Event
- swoole_event_add
- swoole_event_set
- swoole_event_isset
- swoole_event_write
- swoole_event_del
- swoole_event_exit
- swoole_event_defer
- swoole_event_cycle
- swoole_event_wait
- swoole_event_dispatch
- 常見問題
- epoll_wait 偶爾會用很長時間
- 異步回調
- 異步文件系統IO
- swoole_async_readfile
- swoole_async_writefile
- swoole_async_read
- swoole_async_write
- swoole_async_dns_lookup
- swoole_async::exec
- 異步MySQL客戶端
- swoole_mysql->__construct
- swoole_mysql->on
- swoole_mysql->connect
- swoole_mysql->escape
- swoole_mysql->query
- swoole_mysql->begin
- swoole_mysql->commit
- swoole_mysql->rollback
- swoole_mysql->close
- 異步Redis客戶端
- swoole_redis->__construct
- swoole_redis->on
- swoole_redis->connect
- swoole_redis->__call
- swoole_redis->close
- 異步Http/WebSocket客戶端
- swoole_http_client->__construct
- swoole_http_client->set
- swoole_http_client->setMethod
- swoole_http_client->setHeaders
- swoole_http_client->setCookies
- swoole_http_client->setData
- swoole_http_client->addFile
- swoole_http_client->get
- swoole_http_client->post
- swoole_http_client->upgrade
- swoole_http_client->push
- swoole_http_client->execute
- swoole_http_client->download
- swoole_http_client->close
- 異步Http2.0客戶端
- swoole_http2_client->__construct
- swoole_http2_client->get
- swoole_http2_client->post
- swoole_http2_client->setHeaders
- swoole_http2_client->setCookies
- 高級
- Swoole的實現
- Reactor線程
- Manager進程
- Worker進程
- Reactor、Worker、TaskWorker的關系
- Task/Finish特性的用途
- 在php-fpm或apache中使用swoole
- Swoole異步與同步的選擇
- TCP/UDP壓測工具
- swoole服務器如何做到無人值守100%可用
- MySQL的連接池、異步、斷線重連
- PHP中哪些函數是同步阻塞的
- 守護進程程序常用數據結構
- 隊列（Queue）
- 堆（Heap）
- 定長數組（SplFixedArray）
- 使用jemalloc優化swoole內存分配性能
- C開發者如何使用Swoole
- C++開發者如何使用Swoole
- 使用systemd管理swoole服務
- 網卡中斷設置
- 將Swoole靜態編譯內嵌到PHP
- 異步回調程序內存管理
- 日志等級控制
- 使用 asan 內存檢測
- Windows編譯
- Swoole協程之旅-前篇
- Swoole協程之旅-中篇
- Swoole協程之旅-后篇
- 協程CPU密集場景調度實現
- 其他
- 函數列表
- swoole_set_process_name
- swoole_version
- swoole_strerror
- swoole_errno
- swoole_get_local_ip
- swoole_clear_dns_cache
- swoole_get_local_mac
- swoole_cpu_num
- swoole_last_error
- Swoole社區
- Swoole技術會議
- 工作組（Working Groups）
- 參與開源項目指引
- 捐贈Swoole項目
- 加入Swoole開發組
- 非協程特性獨立擴展 （swoole_async）
- 附錄：Linux信號列表
- 附錄：Linux錯誤碼(errno)列表
- 附錄：Swoole錯誤碼列表
- 附錄：TCP連接的狀態
- 附錄：tcpdump抓包工具的使用
- 附錄：strace工具的使用
- 附錄：gdb工具的使用
- 附錄：lsof工具的使用
- 附錄：perf工具的使用
- 附錄：編譯PHP擴展的相關工具
- 備用：已移除的歷史特性
- swoole_server->handler
- task_worker_max
- swoole_server->addtimer
- swoole_server->deltimer
- onTimer
- swoole_timer_add
- swoole_timer_del
- swoole_get_mysqli_sock
- swoole_mysql_query
- onMasterConnect
- onMasterClose
- Nginx/Golang/Swoole/Node.js的性能對比
- Coroutine::call_user_func
- Coroutine::call_user_func_array
- Coroutine\Channel::select
- task_async
- 歷史：版本更新記錄（1.x）
- 1.10.3
- 1.10.2
- 1.10.1
- 1.10.0
- 1.9.23
- 1.9.22
- 1.9.19
- 1.9.18
- 1.9.17
- 1.9.16
- 1.9.15
- 1.9.14
- 1.9.12
- 1.9.11
- 1.9.9
- 1.9.7
- 1.9.6
- 1.9.5
- 1.9.4
- 1.9.3
- 1.9.2
- 1.9.1
- 1.9.0
- 1.8.13
- 1.8.12
- 1.8.11
- 1.8.10
- 1.8.9
- 1.8.8
- 1.8.7
- 1.8.6
- 1.8.5
- 1.8.4
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