我是 PHP 新手，正在关注 YouTube 上的教程。除了文件上传之外，我在这个文件中拥有一切工作，任何帮助将不胜感激。这是我得到的错误：
*注意：我已经找了很多次了，但找不到与 $_FILES 相关的未定义索引错误...
注意：未定义索引：第 95 行 /Applications/xxx 中的头像
注意：未定义索引：第 96 行 /Applications/xxx 中的头像
注意：未定义索引：第 97 行 /Applications/xxx 中的头像
注意：未定义索引：第 98 行 /Applications/xxx 中的头像
抱歉，如果这是一个简单的修复...
<?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") ; ?>