Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

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