这是我的php上传脚本，正如我解释的那样，它显示了未定义的索引:有谁能告诉我这个错误的原因吗?
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Uploading a Photo</title>
<link rel="stylesheet" type="text/css" href="common.css" />
</head>
<body>
<?php
if ( isset( $_POST["sendPhoto"] ) ) {
processForm();
} else {
displayForm();
}
function processForm() {
if ( isset( $_FILES["photo"] ) and $_FILES["photo"]["error"] == UPLOAD_ERR_OK ) {
if ( $_FILES["photo"]["type"] != "image/jpeg" ) {
echo "<p>JPEG photos only, thanks!</p>";
} elseif ( !move_uploaded_file( $_FILES["photo"]["temp_name"],'c:'Downloads' ) ){
echo "<p>Sorry, there was a problem uploading that photo</p>" .
$_FILES["photo"]["error"] ;
} else {
displayThanks();
}
} else {
switch( $_FILES["photo"]["error"] ) {
case UPLOAD_ERR_INI_SIZE:
$message = "The photo is larger than the server allows.";
break;
case UPLOAD_ERR_FORM_SIZE:
$message = "The photo is larger than the script allows.";
break;
case UPLOAD_ERR_NO_FILE:
$message = "No file was uploaded. Make sure you choose a file to
upload.";
break;
default:
$message = "Please contact your server administrator for help.";
}
echo "<p>Sorry, there was a problem uploading that photo. $message</p>";
}
}
function displayForm() {
?>
<h1>Uploading a Photo</h1>
<p>Please enter your name and choose a photo to upload, then click
Send Photo.</p>
<form action="photo_upload.php" method="post" enctype="multipart/
form-data">
<div style="width: 30em;">
<input type="hidden" name="MAX_FILE_SIZE" value="50000" />
<label for="visitorName">Your name</label>
<input type="text" name="visitorName" id="visitorName" value="" />
<label for="photo">Your photo</label>
<input type="file" name="photo" id="photo" value="" />
<div style="clear: both;">
<input type="submit" name="sendPhoto" value="Send Photo" />
</div>
</div>
</form>
<?php
}
function displayThanks() {
?>
<h1>Thank You</h1>
<p>Thanks for uploading your photo<?php if ( $_POST["visitorName"] )
echo ", " . $_POST["visitorName"] ?>!</p>
<p>Here’s your photo:</p>
<p><img src="photos/<?php echo $_FILES["photo"]["name"] ?>" alt="Photo"/></p>
<?php
}
?>
</body>
</html>
这是我的php上传脚本，正如我解释的那样，它显示未定义的索引:照片在processForm()错误可以有人告诉我关于错误。
函数的第一行应该是:
if ( isset( $_FILES["photo"] )
{
if ( $_FILES["photo"]["error"] == UPLOAD_ERR_OK )
{
// the rest of the code
}
}