Implementation method of php mysql query display

<strong><span style="font-size:18px;">
<?php
//PHP查询MySql数据库，将结果用表格输出
    function ShowTable($table_name){
        $conn=mysql_connect("localhost","root","toor");
        if(!$conn){
            echo "连接失败";
        }
        mysql_select_db("test",$conn);
        mysql_query("set names utf8");
        $sql="select * from $table_name";
        $res=mysql_query($sql,$conn);
        $rows=mysql_affected_rows($conn);//获取行数
        $colums=mysql_num_fields($res);//获取列数
        echo "test数据库的"."$table_name"."表的所有用户数据如下：<br/>";
        echo "共计".$rows."行 ".$colums."列<br/>";
        
        echo "<table><tr>";
        for($i=0; $i < $colums; $i++){
            $field_name=mysql_field_name($res,$i);
            echo "<th>$field_name</th>";
        }
        echo "</tr>";
        while($row=mysql_fetch_row($res)){
            echo "<tr>";
            for($i=0; $i<$colums; $i++){
                echo "<td>$row[$i]</td>";
            }
            echo "</tr>";
        }
        echo "</table>";
    }
    ShowTable("test1");
?></span></strong>