Steps to access database in php

There are 7 steps in total for php to access the database. The following is a detailed description

Connecting to the database server(recommended learning: PHP video tutorial)

//参数1：数据库所在服务器的域名<br/>//参数2：登录数据库的用户名<br/>//参数3：登录数据库的密码<br/>$con = mysqli_connect("localhost:3306","root","")<br/>or die(mysqli_connect_error());<br/>//die终止程序代码执行，并输出错误信息<br/>

Select the database to connect

$dataBase = mysqli_select_db($con,"zzq1802")<br/>or die(mysqli_connect_error());<br/>

Set the encoding format

$dataBase = //mysqli_query:执行语句<br/>mysqli_query($con,"set names utf8");<br/>

Write sql statement

$sql = "SELECT * FROM student";<br/>

Execute the sql statement and receive the execution result

$result = mysqli_query($con,$sql);<br/>

Put the result Enter the array

$arr = array();<br/>while($row = mysqli_fetch_assoc($result)){<br/>    array_push($arr,$row);<br/>}<br/>

Return the results obtained from the database to the front end

$arr = array();<br/>echo json_encode($arr);<br/>

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