php如何刪除數(shù)據(jù)庫

<?php
$dbhost = 'localhost'; // mysql服務(wù)器主機(jī)地址
$dbuser = 'root'; // mysql用戶名
$dbpass = 'root'; // mysql用戶名密碼
$conn = mysqli_connect($dbhost, $dbuser, $dbpass);
if(! $conn )
{
 die('連接失敗: ' . mysqli_error($conn));
}
$sql = 'DROP DATABASE test2';
$retval = mysqli_query( $conn, $sql );
if(! $retval )
{
 die('刪除數(shù)據(jù)庫失敗: ' . mysqli_error($conn));
}
echo "數(shù)據(jù)庫 test2 刪除成功\n";
mysqli_close($conn);
?>