数据库连接的学习笔记

abstract：<?php//加上@符 报错信息不回显示$db = @mysqli_connect('127.0.0.1','root','root','phpcn','3306','');//不加的话会显示报错的行数//$db = mysqli_connect('127.0.0.1','

<?php

//加上@符 报错信息不回显示

$db = @mysqli_connect('127.0.0.1','root','root','phpcn','3306','');

//不加的话会显示报错的行数

//$db = mysqli_connect('127.0.0.1','root','root1','phpcn','3306','');

//mysqli_connect_error() 输出错误原因 不显示第几行

if(!$db){

exit('数据库连接失败'.mysqli_connect_error());

}

mysqli_close($db);

print_r($db);