What is the php database interface?

What databases does php support (which database interfaces does it have) (recommended learning: PHP video tutorial)

Adabas D ，InterBase ，PostgreSQL ，dBase ，FrontBase ，SQLite ，Empress ，mSQL ，Solid ，FilePro（只读），Direct MS-SQL ，Sybase ，Hyperwave ，MySQL ，Velocis ，IBM DB2 ，ODBC ，Unix dbm ，informix ,Oracle（OCI7 和 OCI8)，Ingres ，Ovrimos

and above Databases are supported. In short, most mainstream databases are supported.

php native operation method of mysql database

<?php
//数据库操作
//1.导入数据库
require("../../public/dbconfig.php");
//2.连接数据库
$link=mysql_connect(HOST,USER,PASS) or die("数据库连接失败");
//3.选择数据库，设置字符集
mysql_select_db(DBNAME,$link);
mysql_set_charset("utf8");
//4.编写sql语句，发送sql语句到数据库
$sql="select * from users";
$res=mysql_query($sql,$link);
//5.解析结果集
while($user=mysql_fetch_assoc($res)){
echo "<tr align=&#39;center&#39;>";
echo "<td>{$userstate[$user[&#39;state&#39;]]}</td>";
echo "<td>{$user[&#39;username&#39;]}</td>";
echo "<td>".date("Y-m-d",$user[&#39;addtime&#39;])."</td>";
echo "<td>
<a href=&#39;edit.php?id={$user[&#39;id&#39;]}&#39;>修改</a> 
<a href=&#39;action.php?a=del&id={$user[&#39;id&#39;]}&#39;>删除</a>
</td>";
echo "</tr>";
}
mysql_free_result($res);
mysql_close($link);
?>

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