socket_last_error

(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)

socket_last_error返回套接字上的最后一个错误

说明

socket_last_error(?Socket $socket = null): int

如果将 Socket 实例传递给此函数,将会返回指定套接字发生的最后一个错误。如果 socketnull, 则返回最后一个失败的套接字函数的错误码。此函数对以下情况特别有帮助: socket_create() 失败时不会返回套接字,以及 socket_select() 失败的原因与特定套接字没有直接联系。 错误码适合提供给 socket_strerror(),将返回指定错误码的字符串描述。

如果没有错误或者已经使用 socket_clear_error() 清除了错误,则函数返回 0

参数

socket

通过 socket_create() 创建的 Socket 实例。

返回值

此函数返回套接字错误码。

更新日志

版本 说明
8.0.0 现在 socketSocket 实例, 之前是 resource
8.0.0 socket 现在可为空(nullable)。

范例

示例 #1 socket_last_error() 示例

<?php
$socket 
= @socket_create(AF_INETSOCK_STREAMSOL_TCP);

if (
$socket === false) {
    
$errorcode socket_last_error();
    
$errormsg socket_strerror($errorcode);
    
    die(
"Couldn't create socket: [$errorcode$errormsg");
}
?>

注释

注意:

socket_last_error() 不会清除错误代码,如果需要可以使用 socket_clear_error() 清除。

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User Contributed Notes 2 notes

up
11
ca at php dot spamtrak dot org
12 years ago
This is a bit long, but personally I prefer to use the standard C defines in my code.

<?php

define
('ENOTSOCK',      88);    /* Socket operation on non-socket */
define('EDESTADDRREQ'89);    /* Destination address required */
define('EMSGSIZE',      90);    /* Message too long */
define('EPROTOTYPE',    91);    /* Protocol wrong type for socket */
define('ENOPROTOOPT',   92);    /* Protocol not available */
define('EPROTONOSUPPORT', 93);  /* Protocol not supported */
define('ESOCKTNOSUPPORT', 94);  /* Socket type not supported */
define('EOPNOTSUPP',    95);    /* Operation not supported on transport endpoint */
define('EPFNOSUPPORT'96);    /* Protocol family not supported */
define('EAFNOSUPPORT'97);    /* Address family not supported by protocol */
define('EADDRINUSE',    98);    /* Address already in use */
define('EADDRNOTAVAIL', 99);    /* Cannot assign requested address */
define('ENETDOWN',      100);   /* Network is down */
define('ENETUNREACH',   101);   /* Network is unreachable */
define('ENETRESET',     102);   /* Network dropped connection because of reset */
define('ECONNABORTED'103);   /* Software caused connection abort */
define('ECONNRESET',    104);   /* Connection reset by peer */
define('ENOBUFS',       105);   /* No buffer space available */
define('EISCONN',       106);   /* Transport endpoint is already connected */
define('ENOTCONN',      107);   /* Transport endpoint is not connected */
define('ESHUTDOWN',     108);   /* Cannot send after transport endpoint shutdown */
define('ETOOMANYREFS'109);   /* Too many references: cannot splice */
define('ETIMEDOUT',     110);   /* Connection timed out */
define('ECONNREFUSED'111);   /* Connection refused */
define('EHOSTDOWN',     112);   /* Host is down */
define('EHOSTUNREACH'113);   /* No route to host */
define('EALREADY',      114);   /* Operation already in progress */
define('EINPROGRESS',   115);   /* Operation now in progress */
define('EREMOTEIO',     121);   /* Remote I/O error */
define('ECANCELED',     125);   /* Operation Canceled */
?>
up
-1
divinity76 at gmail dot com
3 years ago
note that socket_last_error() cache the last error from the last socket syscall, it does not actually query the OS for the last error on the socket, so if an async socket have an error after the last async operation started successfully, socket_last_error() doesn't know about it, but  socket_get_option($sock, SOL_SOCKET, SO_ERROR) actually query the OS, or so it seems... observed on PHP 7.1.16 on Cygwin on win7 x64 SP1 with non-blocking sockets, socket_last_error() never caught on to the fact that the current error had changed from EINPROGRESS (non-blocking connect) to 0 (connection successful)
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