How to query a field in mysql table in php

How to query a field in php: first connect to the server and connect to the available database on the server; then select the database for operation; then set the encoding; finally query through the "mysql_query($sql,$my_conn);" method That’s it.

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Specific questions:

There is a table of members. How to query the tel value in the user table username=1234. I only want to display this value

Implementation method:

<?php
$host_name="服务器名"; //服务器名
$host_user="用户名"; //连接服务器的用户名
$host_pass="服务器的密码"; //连接服务器的密码
$db_name="数据库名"; //服务器上的可用数据库
$my_conn=mysql_connect($host_name,$host_user,$host_pass); //连接服务器
mysql_select_db($db_name,$my_conn); //选择操作的数据库
mysql_query("SET NAMES utf-s"); //设置编码
$sql="select tel from members where username=1234";
$query=mysql_query($sql,$my_conn);
while($row=mysql_fetch_array($query))
{
  echo $row[0];
}
?>

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