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# socket_last_error

(PHP 4 >= 4.1.0, PHP 5)

socket_last_error -- Returns the last error on the socket

## Description

int socket_last_error ( [resource socket])

切記!
這個函數是實驗性質的。這個函數的行為、名稱、和關於此函數的任何其他文件在未來PHP的發行中可能會在不通知的情況下改變。 使用此延伸需自行承擔風險。

This function returns a socket error code.

If a socket resource is passed to this function, the last error which occurred on this particular socket is returned. If the socket resource is omitted, the error code of the last failed socket function is returned. The latter is in particular helpful for functions like socket_create() which don't return a socket on failure and socket_select() which can fail for reasons not directly tied to a particular socket. The error code is suitable to be fed to socket_strerror() which returns a string describing the given error code.

`<?php if (false == ($socket = @socket_create(AF_INET, SOCK_STREAM, SOL_TCP))) { die("Couldn't create socket, error code is: " . socket_last_error() . ",error message is: " . socket_strerror(socket_last_error())); } ?>`

> 備注: socket_last_error() does not clear the error code, use socket_clear_error() for this purpose.

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