1.9.24 异步客户端自动解析域名

在1.9.24之前的版本，如果Client要通过域名连接服务器，需要手工调用swoole_async_dns_lookup函数，否则底层会发生阻塞。在最新的1.9.24中底层支持了自动异步解析域名，不再需要显式调用swoole_async_dns_lookup。

有效范围

• Swoole\Client
• Swoole\Http\Client
• Swoole\Coroutine\Client
• Swoole\Coroutine\Http\Client

旧版本

swoole_async_dns_lookup("www.baidu.com", function ($domain, $ip) {
    $client = new swoole_client(SWOOLE_SOCK_TCP, SWOOLE_SOCK_ASYNC);
    $client->on("connect", function(swoole_client $cli) {
        $cli->send("GET / HTTP/1.1\r\n\r\n");
    });
    $client->on("receive", function(swoole_client $cli, $data){
        echo "Receive: $data";
        $cli->send(str_repeat('A', 100)."\n");
        sleep(1);
    });
    $client->on("error", function(swoole_client $cli){
        echo "error\n";
    });
    $client->on("close", function(swoole_client $cli){
        echo "Connection close\n";
    });
    $client->connect( $ip, 9501);
});

新版本

$client = new swoole_client(SWOOLE_SOCK_TCP, SWOOLE_SOCK_ASYNC);
$client->on("connect", function(swoole_client $cli) {
    $cli->send("GET / HTTP/1.1\r\n\r\n");
});
$client->on("receive", function(swoole_client $cli, $data){
    echo "Receive: $data";
    $cli->send(str_repeat('A', 100)."\n");
    sleep(1);
});
$client->on("error", function(swoole_client $cli){
    echo "error\n";
});
$client->on("close", function(swoole_client $cli){
    echo "Connection close\n";
});
//底层会自动进行异步域名解析
$client->connect('www.baidu.com', 9501);