PHP socket_bind() : unable to bind address [10013]

Question

我正在尝试与特定硬件建立 udp 套接字连接，该硬件在端口 7715 接收数据，将答案发送到 udp 端口​​ 7714，端口无法更改。下面的一段代码:

<?php
$socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);

if (!socket_bind($socket, '192.168.1.254', 7714)){
    echo socket_strerror(socket_last_error($socket));
}

socket_connect($socket, '192.168.1.150', 7715);
if (!socket_listen($socket, 5)){
    echo socket_strerror(socket_last_error($socket));
}

$arr = [0x23, 0x00, 0x0C, 0x0E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06];
$checksum = 0x00 - array_sum($arr);
$str = implode(', ', $arr);

$eval = '$buffer = ' . "pack('c*', $str, $checksum);";
eval($eval);

socket_write($socket, $buffer);

防火墙禁用，Wireshark 显示，一切正常:

1 0.000000 192.168.1.254 192.168.1.150 UDP 54 65213 → 7715 Len=12

2 0.005611 192.168.1.150 192.168.1.254 UDP 78 7715 → 7714 Len=36

不知何故，PHP 可以将此套接字绑定(bind)到任何 udp 端口​​，但不能绑定(bind)到 7714。

Warning: socket_bind(): unable to bind address [10013]: An attempt was made to access a socket in a way forbidden by its access permissions.

Warning: socket_listen(): unable to listen on socket [10045]: The attempted operation is not supported for the type of object referenced.

有什么问题？

Answer 1

发现自己，udp端口7714被其他进程使用。