PHP连接MYSQL(代码)

<?php
$db_host='hostname is database server ';
$db_database='database name';
$db_username='username';
$db_password='password';
$connection=mysql_connect($db_host,$db_username,$db_password);//连接到数据库
mysql_query("set names 'utf8'");//编码转化
if(!$connection){
die("could not connect to the database:</br>".mysql_error());//诊断连接错误

}
$db_selecct=mysql_select_db($db_database);//选择数据库
if(!$db_selecct)
{
die("could not to the database</br>".mysql_error());
}
$query="select * from msu ";//构建查询语句
$result=mysql_query($query);//执行查询
if(!$result)
{
die("could not to the database</br>".mysql_error());

}
// array mysql_fetch_row(resource $result);
while($result_row=mysql_fetch_row(($result)))//取出结果并显示
{
$num=$result_row[0];
$age=$result_row[1];
$name=$result_row[2];
echo "<tr>";
echo "<td>$num</td>";
echo "<td>$age</td>";
echo "<td>$name</td>";
echo "</tr>";
}

mysql_close($connection);//关闭连接
?>