預設常數

以下常數由擴充功能定義,因此只有在擴充功能被編譯到 PHP 中,或者在執行時被動態載入後才有效。

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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