Question

虽然我是php的新手，但我想弄清楚使用删除操作时的错误是什么我有一个数据库表“local_admin”，元组是选区，用户名和密码，选区设置为主键。下面给出了代码，并且页面中没有填充数据表。非常感谢任何帮助。感谢名单。

    <?php

    session_start(); 
    include("header.php"); 
    $logout="You have successfully Loged out! Please log in to continue";
    if(!isset($_SESSION['username']))
        header("location:masteradmin.php");
    else
        $id=$_SESSION['username'];

    if(isset($_POST['logout']))
    {
    session_destroy();
    header("location:masteradmin.php");
    }

       $host="localhost"; // Host name 
       $username="root"; // Mysql username 
       $password=""; // Mysql password 
       $db_name="voting"; // Database name 
       $tbl_name="local_admin"; // Table name 

       // Connect to server and select databse.
       @mysql_connect("$host", "$username", "$password")or die("cannot            
       connect"); 
       @mysql_select_db("$db_name")or die("cannot select DB");




      $sql="SELECT * FROM $tbl_name";
      $result=mysql_query($sql);

      $count=mysql_num_rows($result);
      ?>
        <!--Content starts here-->
        <div class="content">

       <table width="400" border="0" cellspacing="1" cellpadding="0">
   <tr>
   <td><form name="form1" method="post" action="<?php echo   
                                                  $_SERVER['PHP_SELF']; ?>">
   <table width="400" border="0" cellpadding="3" cellspacing="1" 
                                                        bgcolor="#CCCCCC">
   <tr>
   <td bgcolor="#FFFFFF">&nbsp;</td>
   <td colspan="4" bgcolor="#FFFFFF"><strong>Delete Local Admin</strong>    
                                                                    </td>
                                                                    </tr>
   <tr>
   <td align="center" bgcolor="#FFFFFF">#</td>
   <td align="center" bgcolor="#FFFFFF"><strong>Constituency</strong></td>
<td align="center" bgcolor="#FFFFFF"><strong>Username</strong></td>
<td align="center" bgcolor="#FFFFFF"><strong>Password</strong></td>
</tr>

<?php
while($rows=mysql_fetch_array($result)){
?>

<tr>
<td align="center" bgcolor="#FFFFFF"><input name="checkbox[]" type="checkbox" id="checkbox[]" value="<? echo $rows['constituency']; ?>"></td>
<td bgcolor="#FFFFFF"><? echo $rows['constituency']; ?></td>
<td bgcolor="#FFFFFF"><? echo $rows['username']; ?></td>
<td bgcolor="#FFFFFF"><? echo $rows['password']; ?></td>
</tr>

<?php
}
?>

<tr>
<td colspan="5" align="center" bgcolor="#FFFFFF"><input name="delete" type="submit" id="delete" value="Delete"></td>
</tr>

<?php

// Check if delete button active, start this 

if(isset($_POST['delete']))
{
    $checkbox = $_POST['checkbox'];
for($i=0;$i<$count;$i++){
$del_id = $checkbox[$i];
$sql = "DELETE FROM $tbl_name WHERE name='$del_id'";
$result = mysql_query($sql);
}
// if successful redirect to delete_multiple.php 
if($result){
echo "<meta http-equiv=\"refresh\" content=\"0;URL=deletelocaladmin.php\">";
}
}
mysql_close();
?>

</table>
</form>
</td>
</tr>
</table>

</div>

<?php include("footer.php"); ?>

Answer 1

除了上面的mysql扩展建议，您还应验证输入。偏移错误是指索引不属于数组

// load selected checkboxes or false
$checkbox = isset($_POST['checkbox'])?$_POST['checkbox']:false;

$result = false;
if(is_array($checkbox)) {
    for($i=0;$i<$count;$i++){
        if(isset($checkbox[$i])) { // the index may not exist
            // should be using PDO 
            $del_id = mysql_real_escape_string($checkbox[$i]); 
            // you are using constituency on the html checkbox value
            // but here you are using the name field?
            $sql = "DELETE FROM $tbl_name WHERE name='$del_id'";
            $result = mysql_query($sql);
        }
    }
}

注意：未定义的偏移量：在第80行的C：\ wamp \ www \ testing \ deletelocaladmin.php中为1

1 个答案: