Select the specified MySQL database

<?PHP/******************************** * * * Function: Select the specified MySQL database *********************************/? ><! DOCTYPE html Public"-//w3c//dtd XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >PHP$conn=mysql_connect("localhost", "root", "" "); $rs=mysql_query("Show Databases");//Query Action//display the database name as a drop-down list     while($rst=Mysql_fetch_array($rs)){        $i= 0; Echo"<option value =".$rst[$i]." > ".$rst[$i]." </option> "; $i++; }?> </select> <input type= "Submit" Name= "sub" value= "OK"/&GT;&LT;/FORM&GT;&LT;/TD&GT;&LT;/TR&GT;&LT;TR&G T;&LT;TD background= "Image/head. JPG "> <?PHPif(!Empty($_post["Sub"])){            if($_post["select"] = = "1"){                Echo"<script>alert (' Please select database ');</script>"; }Else{                if(mysql_select_db($_post["Select"],$conn)){                    Echo"<script>alert (' already connected to the specified database ');</script>"; Mysql_close(); }Else{                    Echo"<script>alert (' wrong ');</script>"; }            }        }    ?></td></tr></table></body>
Select the specified MySQL database