php怎么写删除整个数据库语句呢？请教各位大师！
$hostnames = 'localhost';
$userids = 'root';
$passwords = '123456';
$database = '213';
$conn = mysql_connect($hostnames,$userids,$passwords);
mysql_select_db($database,$conn);
$sql = "drop database `213`";
mysql_close($conn);
------解决方案--------------------
$conn = mysql_connect($hostnames,$userids,$passwords);
mysql_select_db($database,$conn);
mysql_query("drop database `213`");
mysql_close($conn);
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