php教程

预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

System V message constants
Constant Type Changelog
MSG_IPC_NOWAIT integer  
MSG_EAGAIN integer As of 5.2.0
MSG_ENOMSG integer As of 5.2.0
MSG_NOERROR integer  
MSG_EXCEPT integer  

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