What is the use of swoole client?

PHP commonly uses sockets to create TCP connections and CURL to create HTTP connections. In order to simplify the operation, Swoole provides the Client class to implement client functions and adds asynchronous non-blocking mode, allowing users to use the event loop on the client side. (Recommended learning: swoole video tutorial)

As a client, Swoole Client can be used in FPM environment or Apache, but Async asynchronous mode is not allowed, only Use synchronous non-blocking mode, asynchronous non-blocking mode is only available in CLI mode.

Client provides the encapsulation code of the TCP/UDP socket client. Only new Swoole\Client is needed to use it.

What are the advantages of Swoole's socket client over the stream family functions provided by PHP?

The stream function has timeout traps and bugs. If not handled properly, the server will be blocked for a long time.

stream and fread have a length limit of 8192 and cannot support UDP large packets.

swoole_client client supports waitall. When the packet length is known, it can be retrieved at once without looping.

swoole_client supports UDP connect to solve the problem of UDP packet string

swoole_client is pure C code

swoole_client supports asynchronous non-blocking callbacks

Constructor method constructor

Swoole's Client function is encapsulated as a swoole_client class, and a client instance can be created through new swoole_client.

Prototype

swoole_client->__construct(
  int $sock_type, 
  int $is_async = SWOOLEL_SOCK_SYNC, 
  string $key);

Parameter

Parameter 1: int $sock_type

$sock_type represents the socket type , you can use the macro provided by swoole to specify the type.

SWOOLE_TCP 创建TCP Socket
SWOOLE_TCP6 创建IPv6 TCP Socket
SWOOLE_UDP 创建UDP Socket
SWOOLE_UDP6 创建IPv6 UDP Socket
SWOOLE_SSL 开启SSL加密
SWOOLE_KEEP 开启连接复用

SWOOLE_SSL and SWOOLE_KEEP cannot be used alone and need to work together with the first four options.

// 创建并开启SSL加密的TCP客户端
$client = new swoole_client(SWOOLE_TCP | SWOOLE_SSL);

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