How does php detect whether the socket link is broken?

for example, PHP how to detect whether the socket link is broken?

Php socket
Feb.28,2021

the client sends heartbeat packets to the server regularly. If the server does not receive the heartbeat packet for a long time, the client is determined to be offline

.

Previous: What is the bug that prevents Android N from requiring the use of FLAG_ACTIVITY_NEW_TASK??

Next: In the use of react router, the page url is changed, and the content is not refreshed. It needs to be manually refreshed before it will be changed. What is the problem? thank you.

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e43d1f-6507e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e43d1f-6507e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?