我是PHP新手，正在关注YouTube上的教程。我有一切在这个文件中工作，除了文件上传，任何帮助将不胜感激。这是我得到的错误：
*注意：我已多次查找，但找不到与$ _FILES相关的未定义索引错误...
注意：未定义的索引：第95行/ Applications / xxx中的头像
注意：未定义的索引：第96行/ Applications / xxx中的头像
注意：未定义的索引：97行/ Applications / xxx中的头像
注意：未定义的索引：第98行/ Applications / xxx中的头像
对不起，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") ; ?>
答案 0 :(得分：22)
要上传文件，您必须在表格标记中使用enctype。
<form enctype="multipart/form-data" action='register.php' method='post'>
答案 1 :(得分：10)
首先：尝试严格编程
error_reporting(E_ALL | E_STRICT);
你也必须使用isset for check is index for array available not not
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
发布最大尺寸必须大于上传最大文件大小。
也有人说检查表 enctype
答案 2 :(得分：5)
您应该将表单属性enctype="multipart/form-data"添加到上传文件
答案 3 :(得分：3)
这是1年前发布但你可能仍然感兴趣.. 在PHP.ini中选中此选项： enable_post_data_reading =关 它应该是：否则$ _FILES将永远是空的 PHP是否将读取POST数据默认情况下启用此选项。 最有可能的是，您不希望全局禁用此选项。它导致$ _POST 和$ _FILES总是为空。