php 連接數據庫 Warning: mysqli_connect(): (HY000/2002): No such file or directory in

1.錯誤代碼

   //主機名
    $db_host = 'localhost';
//用戶名
    $db_user = 'jaing';
//密碼
    $db_password = '1';
//數據庫名
    $db_name = 'rongShop';
//端口
    $db_port = '3306';
//連接數據庫
    $conn = mysqli_connect($db_host,$db_user,$db_password,$db_name) or die('連接數據庫失敗！');

錯誤原因：未加端口參數；用戶名填寫錯誤

修改db_host,$db_user即可

   //主機名
    $db_host = 'localhost：3306';
//用戶名
    $db_user = 'jiang';
//密碼
    $db_password = '1';
//數據庫名
    $db_name = 'rongShop';
//端口
    $db_port = '3306';
//連接數據庫
    $conn = mysqli_connect($db_host,$db_user,$db_password,$db_name) or die('連接數據庫失敗！');