socket_last

Description

int socket_last_error ( [resource socket])

警告

本扩展模块是实验性的。该模块的行为，包括其函数的名称以及其它任何关于此模块的文档可能会在没有通知的情况下随 PHP 以后的发布而改变。我们提醒您在使用本扩展模块的同时自担风险。

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())); } ?>

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