<?php $str_sql_read="select count(*) as num from userinfo"; $str_sql_del="delete from userinfo where id =1"; $res =link_mysql("read",$str_sql_read); $res_del =link_mysql("delete",$str_sql_del); echo $res_del."<br/>"; while($row = mysql_fetch_assoc($res)) {  echo "<font style='font-size:25px;color:red;'>".$row['num']."</font><br/>"; } ?> <?php function link_mysql($opt,$str_sql) {  $con = mysql_connect("localhost","root","root") or die ('Not connected : ' . mysql_error());  mysql_set_charset("gbk",$con);  //if you donot know how to use this function,find it defination;  mysql_select_db("website",$con);  switch($opt){   case "read":    $res =mysql_query($str_sql);   break;    case "update":   case "delete":   case "insert":    $res =mysql_query($str_sql);   break;     }  mysql_close();  return $res; } ?>