File upload

[________]

Hi there,
I got some small questions about some fileupload functions:

1. If I use the function isset on $FILES['file']['name'] it always returs true... even if there was no value in that field, so I have to use the function $FILES['file']['name'] == ""... why is that?

2. How does the $_FILES['file']['type'] work? I'm writing a picture upload script, and I need to be REALY sure that it's a picture that is uploaded and not any other type of file... I tried to create a text file and renamed it to picture.jpg - and the server rejected the file. Is that funtion safe to use for validating or is that just a coincidence?

Thanks!

[planetsim]

Firstly to check if the file is uploaded

use $_FILES['file']['error'] if == 0 then its uploaded.

Secondly $_FILES['file']['type']

Works like so

image/extention

So JPEG would be image/pjpeg and gif would be image/gif

[MeShane]

Upload Files!
1. Make Folder Named uploads
2. Paste On A Paste And Name It uploader.php
3. Go To uploader.php To Upload Files

<?
$Admin[UploadNum] = "10"; // Number of upload fields to put on the html page
$Admin[Directory] = "uploads";
if($FileUpload) {
for ($Number = 1; $Number <= $Admin[UploadNum]; $Number++){
$PictureFirst = "fileup$Number"."_name";//Set format for variable $OriginalFileName
$OriginalFileName = $$PictureFirst;//Somehow outputs the original file name.
$SetFormatTempFile = "fileup$Number";//Set format for variable $TemporaryFile
$TemporaryFile = $$SetFormatTempFile;
if($TemporaryFile != "none") {
$Filesizebtyes = filesize($TemporaryFile);
$ok = 1;
if($Filesizebtyes < 10) {
$error .= "Error uploading (file size lower than 10 bytes) for file $Number<BR>";
$ok = 2;
}
if(file_exists("$Admin[Directory]/$OriginalFileName") OR $ok == 2) {
$error .="File name already exists for file $Number<BR>";
} else {
copy ($TemporaryFile, "$Admin[Directory]/$OriginalFileName");
$error .="File $Number has been uploaded<BR>";
}
}
}
if(!$error) {
$error .= "No files have been selected for upload";
}
echo $error;
exit();
} else {
echo "<form enctype=\"multipart/form-data\" action=\"uploader.php\" method=\"post\">\n";
for ($Number = 1; $Number <= $Admin[UploadNum]; $Number++){
echo "<input name=\"fileup$Number\" type=\"file\" size=\"25\">\n";
}
echo "<input name=\"FileUpload\" type=\"submit\" value=\"Upload Files\">\n";
exit();
}
?>