致命错误：未捕获错误：调用未定义函数mysqli_ping（）

Question

错误

  

致命错误：未捕获错误：调用未定义函数mysqli_ping（）   在C：\ wamp \ www_server \ server.php：2938堆栈跟踪：＃0   C：\ wamp \ www_server \ server.php（2926）：database-＆gt; connected（）＃1   C：\瓦帕\ www_server \ server.php（37）：   database-＆gt; _construct（'localhost'，'root'，'password123'，'ixatdb'＃2   C：\ wamp \ www_server \ server.php（10）：iXatServer-＆gt; _constru ct（）＃3   （主要）在第2938行的C：\ wamp \ www_server \ server.php中抛出

下面第2938行

return @mysqli_ping($this->‌​link) ? true : false;

以下代码示例

public function __construct($host=null, $user=null, $pass=null, $name=null)
{
    if($name != null)
    {
        $this->host = $host;
        $this->user = $user;
        $this->pass = $pass;
        $this->name = $name;
    }

    if(!$this->connected())
    {
        $this->link = @mysqli_connect($this->host, $this->user, $this->pass, $this->name);
        if(!$this->connected())
        {
            $this->error("Failed to connect to `{$this->host}`.`{$this->name}` using password [" . (empty($this->pass) ? "NO" : 'YES') . "]");
        }
    } return true; // Cause I can put it there if I want to
}

public function connected()
{
    return @mysqli_ping($this->link) ? true : false;
}