socket_getopt

Function name: socket_getopt()

Applicable version: PHP 4 >= 4.3.0, PHP 5, PHP 7

Function description: The socket_getopt() function is used to get the value of the socket option.

Syntax: mixed socket_getopt ( resource $socket , int $level , int $optname )

parameter:

• $socket: Socket resource, returned by socket_create() or socket_accept().
• $level: Option level, which can be a constant at the SOL_SOCKET or other socket protocol level.
• $optname: The option name, which can be a constant of socket options.

Return value:

• If successful, return the value of the option. If the value of the option is an integer type, it will be returned as an integer.
• If the acquisition fails, return FALSE.

Example:

 // 创建套接字$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); if ($socket === false) { echo "socket_create() 失败： " . socket_strerror(socket_last_error()) . "\n"; exit; } // 设置套接字选项socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1); // 获取套接字选项的值$value = socket_getopt($socket, SOL_SOCKET, SO_REUSEADDR); if ($value !== false) { echo "SO_REUSEADDR 选项的值为： " . $value . "\n"; } else { echo "socket_getopt() 失败： " . socket_strerror(socket_last_error($socket)) . "\n"; } // 关闭套接字socket_close($socket);

In the above example, a socket is first created and the SO_REUSEADDR option is set to 1 using socket_set_option(). Then use socket_getopt() to get the value of the SO_REUSEADDR option and print it out. Finally close the socket.

Please note that the error handling part in the example is only used as a demonstration, and appropriate error handling is required in actual applications according to the specific situation.