(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
socket_last_error — Returns the last error on the socket
If a Socket instance is passed to this function, the last error which
occurred on this particular socket is returned. If socket is
null, the error code of the last failed socket function is returned.
The latter is particularly 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.
If no error had occurred, or the error had been cleared with
socket_clear_error(), the function returns 0.
This function returns a socket error code.
| 版本 | 说明 |
|---|---|
| 8.0.0 |
现在 socket 是 Socket 实例，
之前是 resource。
|
| 8.0.0 |
socket is nullable now.
|
示例 #1 socket_last_error() example
<?php
$socket = @socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if ($socket === false) {
$errorcode = socket_last_error();
$errormsg = socket_strerror($errorcode);
die("Couldn't create socket: [$errorcode] $errormsg");
}
?>
注意:
socket_last_error() does not clear the error code, use socket_clear_error() for this purpose.