PHP 未定义索引错误 $_FILES?

 <?php//de-bugging 在脚本按需要工作后删除它>错误报告(E_ALL)；ini_set(display_errors", 1);//结束调试//$form = "<form action='register.php' method='post'><table cellpacing='5px'><tr><td></td><td><font color='red'>*</font>是必填字段.</td></tr><tr><td>名字:</td><td><input type='text' name='firstname' class='textbox'><font color='red'>*</font></td></tr><tr><td>姓氏:</td><td><input type='text' name='lastname' class='textbox'><font color='red'>*</font></td></tr><tr><td>用户名:</td><td><input type='text' name='username' class='textbox'><font color='red'>*</font></td></tr><tr><td>电子邮件:</td><td><input type='text' name='email' class='textbox'><font color='red'>*</font></td></tr><tr><td>密码:</td><td><input type='password' name='password' class='textbox'><font color='red'>*</font></td></tr><tr><td>确认密码:</td><td><input type='password' name='repassword' class='textbox'><font color='red'>*</font></td></tr><tr><td>个人资料图片:</td><td><input name='avatar' type='file' ></td></tr><tr><td>个人资料消息:</td><td><textarea name='bio' cols='35' rows='5' class='textbox'></textarea></td></tr><tr><td></td><td><input type='submit' name='submitbtn' value='Submit' class='button'></td></tr></form>";如果 ($_POST['submitbtn']) {$firstname = strip_tags($_POST['firstname']);$lastname = strip_tags($_POST['lastname']);$username = strip_tags($_POST['username']);$email = strip_tags($_POST['email']);$class = ($_POST['class']);$password = strip_tags($_POST['password']);$repassword = strip_tags($_POST['repassword']);$bio = strip_tags($_POST['bio']);//头像上传$name = $_FILES['avatar'] ['name'];$type = $_FILES['avatar'] ['type'];$size = $_FILES['avatar'] ['size'];$tmpname = $_FILES['avatar'] ['tmpname'];$ext = substr($name, strrpos($name, '.'));if ($firstname && $lastname && $username && $email && $password && $repassword) {if ($password == $repassword) {if (strstr($email, "@") && strstr($email, ".") && strlen($email) >= 6) {要求(脚本/connect.php")；$query = mysql_query("SELECT * FROM users WHERE username='$username'");$numrows = mysql_num_rows($query);如果($numrows == 0){$query = mysql_query("SELECT * FROM users WHERE email ='$email'");$numrows = mysql_num_rows($query);如果($numrows == 0){$pass = (md5(md5($password)));$date = date(F j, Y");如果($姓名){move_uploaded_file($tmpname, "avatars/$username.$ext");$avatar = "$username.$ext";}别的$avatar = "default_avatar.png";$code = substr(md5(rand(111111111111, 999999999999999999)), 2, 25);mysql_query("插入用户值('', '$firstname', '$lastname', '$username', '$email', '$pass', '$avatar', '$bio', '','', '$code', '', '$date')");$webmaster = "xxxx";$subject = "xxxx";$headers = "From:xxx<$webmaster>";$message = "xxx";邮件($email，$subject，$message，$headers)；echo "xxx";}别的echo "那封邮件已经被占用了.$形式";}别的echo "那个用户名已经被占用了.$形式";}别的echo "您没有输入有效的电子邮件.$形式";}别的echo "您的密码不匹配.$形式";}别的echo "您没有填写所有必填字段.$形式";}别的echo "$form";?>

<?php require("styles/bottom.php") ;?>

第一:尽量严格编程

error_reporting(E_ALL | E_STRICT);

你还必须使用isset来检查数组是否可用

if (isset($_POST['submitbtn']) &&isset($_FILES['avatar'])) {//...}

还要检查php配置

file_uploads "1"upload_max_filesize "2M"post_max_size "8M"max_file_uploads 20

帖子最大大小必须大于上传最大文件大小.

也正如人们所说的检查表单enctype

I am new to PHP and am following a tutorial on YouTube. I have everything working in this file, except for the file uploading, any help would be appreciated. Here is the error i am getting:

*NOTE: I have looked for this many times, but could not find undefined index error relevant to $_FILES...

Notice: Undefined index: avatar in /Applications/xxx on line 95

Notice: Undefined index: avatar in /Applications/xxx on line 96

Notice: Undefined index: avatar in /Applications/xxx on line 97

Notice: Undefined index: avatar in /Applications/xxx on line 98

Sorry for this if it is a simple fix...

            <?php $title = "Register";?>
        <?php require ("styles/top.php") ; ?>           
        <?php //de-bugging remove this after script works as desired>
        error_reporting(E_ALL);
         ini_set("display_errors", 1); 
        //end de-bugging//
        
        $form = "<form action='register.php' method='post'>
        <table cellspacing='5px'>
            <tr>
                <td></td>
                <td><font color='red'>*</font> are required fields.</td>
            </tr>
            <tr>
                <td>First Name:</td>
                <td><input type='text' name='firstname' class='textbox'><font color='red'> *</font></td>
            </tr>
            <tr>
                <td>Last Name:</td>
                <td><input type='text' name='lastname' class='textbox'><font color='red'> *</font></td>
            </tr>
            <tr>
                <td>Username:</td>
                <td><input type='text' name='username' class='textbox'><font color='red'> *</font></td>
            </tr>
            <tr>
                <td>Email:</td>
                <td><input type='text' name='email' class='textbox'><font color='red'> *</font></td>
            </tr>
            <tr>
                <td>Password:</td>
                <td><input type='password' name='password' class='textbox'><font color='red'> *</font></td>
            </tr>
            <tr>
                <td>Confirm Password:</td>
                <td><input type='password' name='repassword' class='textbox'><font color='red'> *</font></td>
            </tr>
            <tr>
                <td>Profile Picture:</td>
                <td><input name='avatar' type='file' ></td>
            </tr>
            <tr>
                <td>Profile Message:</td>
                <td><textarea name='bio' cols='35' rows='5' class='textbox'></textarea></td>
            </tr>
            <tr>
                <td></td>
                <td><input type='submit' name='submitbtn' value='Submit' class='button'></td>
                
            </tr>
        </table>
        </form>";
        
        
        if ($_POST['submitbtn']) {
            
            $firstname = strip_tags($_POST['firstname']);
            $lastname = strip_tags($_POST['lastname']);
            $username = strip_tags($_POST['username']);
            $email = strip_tags($_POST['email']);
            $class = ($_POST['class']);
            $password = strip_tags($_POST['password']);
            $repassword = strip_tags($_POST['repassword']);
            $bio = strip_tags($_POST['bio']);
            //AVATAR UPLOAD
            $name = $_FILES['avatar'] ['name'];
            $type = $_FILES['avatar'] ['type'];
            $size = $_FILES['avatar'] ['size'];
            $tmpname = $_FILES['avatar'] ['tmpname'];
            $ext = substr($name, strrpos($name, '.'));
            

            
            if ($firstname && $lastname && $username && $email && $password && $repassword) {
                if ($password == $repassword) {
                    if (strstr($email, "@") && strstr($email, ".") && strlen($email) >= 6) {
                        
                        require("scripts/connect.php");
                        
                        $query = mysql_query("SELECT * FROM users WHERE username ='$username'");
                        $numrows = mysql_num_rows($query);
                        if ($numrows == 0) {
                        
                            $query = mysql_query("SELECT * FROM users WHERE email ='$email'");
                            $numrows = mysql_num_rows($query);
                            if ($numrows == 0) {
                            
                                $pass = (md5(md5($password)));
                                $date = date("F j, Y");

                                if($name){
                                        move_uploaded_file($tmpname, "avatars/$username.$ext");
                                        $avatar = "$username.$ext";
                                        }
                                        else
                                            $avatar = "default_avatar.png";
                                        
                                    $code = substr(md5(rand(111111111111, 99999999999999999)), 2, 25);  
                            
                                
                                mysql_query("INSERT INTO users VALUES ('', '$firstname', '$lastname', '$username', '$email', '$pass', '$avatar', '$bio', '', '', '$code', '', '$date')"); 
                                
                                    $webmaster = "xxxx";
                                    $subject = "xxxx";
                                    $headers = "From:xxx<$webmaster>";
                                    $message = "xxx";
                                    
                                    mail($email, $subject, $message, $headers);
                                    
                                    echo "xxx";
                                                        
                            }
                            else
                                echo "That email is already taken. $form";
                        }
                        else
                            echo "That username is already taken. $form";
                        
                    }
                    else
                        echo "You did not enter a valid email. $form";
                
                }
                else
                    echo "Your passwords did not match. $form";
            }
            else
                echo "You did not fill in all of the required fields. $form";
                
            }
            else
                echo "$form";
            
            ?>
        
            </div>
            <?php require ("styles/bottom.php") ; ?>

first: try to strict programming

error_reporting(E_ALL | E_STRICT);

also you must use isset for check is index for array available or not

if (isset($_POST['submitbtn']) && isset($_FILES['avatar'])) {
     // ...
}

also check php configuraion

file_uploads    "1"
upload_max_filesize     "2M"
post_max_size   "8M"
max_file_uploads    20

post max size must be larger than upload max file size.

also as guys said check form enctype

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