[李景山php] swoole 异步 mysql 连接

$db = new swoole_mysql;$server = array(    'host' => '192.168.50.145',    'user' => 'root',    'password' => 'flzx_3QC',    'database' => 'mysql',    'chatset' => 'utf8', //指定字符集);$db->connect($server, function ($db, $r) {    if ($r === false){        var_dump($db->connect_errno, $db->connect_error);        die;    }    $sql = 'show tables';    $db->query($sql, function(swoole_mysql $db, $r) {        global $s;        if ($r === false){            var_dump($db->error, $db->errno);        }        elseif ($r === true ){            var_dump($db->affected_rows, $db->insert_id);        }        var_dump($r);        $db->close();    });});