socket_set_block

Function name: socket_set_block()

Function description: The socket_set_block() function sets the socket to blocking mode, that is, the execution of the program will be blocked during read and write operations until the operation is completed.

Applicable versions: All PHP versions

Syntax: bool socket_set_block ( resource $socket )

parameter:

• $socket: Required, socket resource to be set to blocking mode.

Return value:

• Return true if set successfully.
• If the setting fails, return false.

Example:

 // 创建套接字$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); if ($socket === false) { echo "套接字创建失败: " . socket_strerror(socket_last_error()) . "\n"; exit; } // 连接到服务器$result = socket_connect($socket, '127.0.0.1', 8080); if ($result === false) { echo "无法连接到服务器: " . socket_strerror(socket_last_error($socket)) . "\n"; exit; } // 将套接字设置为阻塞模式if (socket_set_block($socket) === false) { echo "设置套接字为阻塞模式失败: " . socket_strerror(socket_last_error($socket)) . "\n"; exit; } // 从套接字中读取数据（在阻塞模式下会一直等待数据到达） $data = socket_read($socket, 1024); if ($data === false) { echo "读取数据失败: " . socket_strerror(socket_last_error($socket)) . "\n"; exit; } // 关闭套接字socket_close($socket);

In the above example, we create a socket and connect to the server. Then, we use socket_set_block() function to set the socket to blocking mode. Next, we use the socket_read() function to read data from the socket. Since the socket is in blocking mode, the program will wait for the data to arrive. Finally, we close the socket.

Note that socket_set_block() function is only suitable for blocking mode. If you need to set the socket to non-blocking mode, use socket_set_nonblock() function.