PHP新手

Question

刚学PHP不久,请教大家一个有个问题:if(@$db_conn=mysql_connect($this->servername,$this->server_username,$this->server_userpwd)){
    if(!mysql_select_db($this->database,$db_conn)){
echo "数据库连接出错";
exit;
}else{
echo "服务器正在维护,请稍后重试";
exit;
};
那个“@”运算符是什么意思？

Answer 1

@表示禁止显示出错信息。应该是在mysql_connect前边写吧

Answer 2

@屏蔽错误输出等同于
if($db_conn=@mysql_connect($this->servername,$this->server_username,$this->server_userpwd))

Answer 3

抑制错误的   还不如去掉直接写为：
$db_conn=mysql_connect($this->servername,$this->server_username,$this->server_userpwd) or die('无法连接数据库');