聊天室php&mysql(四)

<?
include “../signup/mysql.php”;
header(“Expires: Sun, 28 Dec 1997 09:32:45 GMT”);
header(“Cache-Control: no-cache, must-revalidate”);
header(“Pragma: no-cache”);
header(“Content-Type: text/html; charset=${Charset}”);

?>

<meta http-equiv="Refresh" content="4; url=?userid=”>

<?    
    $max_row_length=30;   

    $select=”select row from user_message order by row DESC”;
        $result=mysql_query($select)or die(” false fgfg”);
        $rowlist=mysql_fetch_array($result)or die(“false”);
        $max_row=$

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rowlist[“row”];

    if($max_row>$max_row_length){

     
        $delete_row=$max_row-$max_row_length+1;

     // echo $max_row.”
“.$delete_row;
         $select=”select row from user_message where row<".$delete_row;
        $result=mysql_query($select)or die(” false”);
        while($row=mysql_fetch_array($result))
            {
                  $sql=”delete from user_message where row <".$delete_row;

                  mysql_query($sql)or die (“del false1”);
             }

            $left=$delete_row;
                 }

    else {$left=1;  

         }

   for($i=$max_row; $i>=$left ;$i–)
    {
     $sql=”SELECT message,userid,object,status,color,action1,time1 FROM user_message where row=’$i'”;
     $result=mysql_query($sql)or die(mysql_error());
     $row=mysql_fetch_array($result);
     $time1=$row[“time1”];

     $usert1=$row[“userid”];
     $objectt1=$row[“object”];
     $sql=”select id from chat_user_list where userid=’$usert1′”;
     $result=mysql_query($sql)or die(mysql_error());
     $rowt1=mysql_fetch_array($result);
     $usert5=$rowt1[“id”];

     $sql=”select id from chat_user_list where userid=’$objectt1′”;
     $result=mysql_query($sql)or die(mysql_error());
     if($rowt2=mysql_fetch_array($result))
     $bojectt5=$rowt2[“id”];
     else $bojectt5=”大家”;

     if($row[“userid”]!=$userid){

     $user1=””.$usert5.””;
     }
     else $user1=$usert5;
     if($row[“object”]!=$userid){

     $user2=””.$bojectt5.””; }
     else $user2=$bojectt5;
     $message2=$row[“message”];
     $message3=htmlspecialchars($message2);

$message1=”“.$user1.” 对”.$user2.” “.$row[“action1″].”: “.$message3.”” ;

    if($row[“status”]==1){
         if($row[“object”]==$userid||$row[“userid”]==$userid)
        echo “私聊“.$time1.” “.$message1.”
“;
         else continue;
         }
    else {  
        echo $time1.” “.$message1.”
“;

         }
    }

?>