使用mysqliConnect时解析类中的异常错误问题

Question

你好，当你看到家伙时，我不知道这个问题是什么！！

但是在函数内声明$ sq = mysqli_con ...可行。

代码：

class MainClass  
{


public $isConnected;

private static $servName        = "localhost";
private static $DbName          = "ofppt";
private static $pwd             = "00000000";
private static $usr             = "root";
private static $sq =    mysqli_connect(self::$servName,self::$usr,self::$pwd,self::$DbName);

public function sqlCon()
{
    if(self::$sq)
    {
        $this->isConnected = true;
        return true;
    }
    else
    {
        $this->isConnected = false;
        return false;       
    }
}
}