The socket extension implements a low-level interface to the socket communication functions based on the popular BSD sockets, providing the possibility to act as a socket server as well as a client.
For a more generic client-side socket interface, see stream_socket_client(), stream_socket_server(), fsockopen(), and pfsockopen().
When using these functions, it is important to remember that while many of them have identical names to their C counterparts, they often have different declarations. Please be sure to read the descriptions to avoid confusion.
Those unfamiliar with socket programming can find a lot of useful material in the appropriate Unix man pages, and there is a great deal of tutorial information on socket programming in C on the web, much of which can be applied, with slight modifications, to socket programming in PHP. The Unix Socket FAQ might be a good start.
警告 |
這個延伸是實驗性質的。這個延伸的行為 -- 包括函數名稱和包含此延伸的任何其它文件 -- 在未來PHP的發行中可能會在不通知的情況改變。使用此延伸需自行承擔風險。 |
建立這個延伸不需要任何外部程式庫。
The socket functions described here are part of an extension to PHP which must be enabled at compile time by giving the --enable-sockets option to configure.
注: PHP 5.0 起加入了 IPv6 的支援
php.ini中沒有定義此延伸的組態指令。
這個延伸沒有定義任何資源。
以下的常數由此延伸定義,只在這個延伸被編譯成PHP或實行時期被動態載入時有效。
The socket extension was written to provide a useable interface to the powerful BSD sockets. Care has been taken that the functions work equally well on Win32 and Unix implementations. Almost all of the sockets functions may fail under certain conditions and therefore emit an E_WARNING message describing the error. Sometimes this doesn't happen to the desire of the developer. For example the function socket_read() may suddenly emit an E_WARNING message because the connection broke unexpectedly. It's common to suppress the warning with the @-operator and catch the error code within the application with the socket_last_error() function. You may call the socket_strerror() function with this error code to retrieve a string describing the error. See their description for more information.
注: The E_WARNING messages generated by the socket extension are in English though the retrieved error message will appear depending on the current locale (LC_MESSAGES):
Warning - socket_bind() unable to bind address [98]: Die Adresse wird bereits verwendet
範例 2. Socket example: Simple TCP/IP client This example shows a simple, one-shot HTTP client. It simply connects to a page, submits a HEAD request, echoes the reply, and exits.
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