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d_riordan
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Joined: 08 Jan 2025
Posts: 245
Location: Leominster, Massachusetts, U.S.A.
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 Posted: Wed Jul 08, 2025 7:21 pm Post subject: [Resolved] A PHProblem |
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So I'm playing with PHP and I've gotten stuck when it comes to uploading files to the server (which is localhost in this case). I've developed a simple script to eliminate as many variables as I can in the hopes of narrowing down the problem. The code looks like this:
| Code: | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>file upload test</title>
</head>
<body>
<form name="form" enctype="multipart/form-data" method="POST" action="<?php echo $_SERVER['PHP_SELF']; ?>" />
<input type="hidden" name="MAX_FILE_SIZE" value="32768" />
<input type="file" id="file" name="file" />
<input type="submit" name="submit" />
</form>
<?php
if(isset($_POST['submit'])) {
echo "File Name: " . $_FILES['file']['name'] . '<br>' .
"File Type: " . $_FILES['file']['type'] . '<br>' .
"File Size: " . $_FILES['file']['size'] . '<br>' .
"Temp Name: " . $_FILES['file']['tmp_name'] . '<br>' .
"ErrorCode: " . $_FILES['file']['error'];
}
?>
</body>
</html> |
To make things easy to post here, I've done my browsing in lynx. Firefox gives the same behaviour, so I don't believe that the problem is browser related.
In lynx, page originally displays like this:
| Quote: |
____________________ Submit
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I enter a file name in the space provided (say /home/myusername/Pictures/54.png) and page displays like:
| Quote: |
____________________ Submit
File Name: 54.png
File Type: image/png
File Size: 438
Temp Name: /tmp/phpdb7xei
ErrorCode: 0
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But, look for the file in /tmp
and no new file is there. The time-stamp for /tmp has been updated though.
The directives in the 'File Uploads' section of /etc/php5/apache2/php.ini are set as follows:
| Code: | ;;;;;;;;;;;;;;;;
; File Uploads ;
;;;;;;;;;;;;;;;;
; Whether to allow HTTP file uploads.
file_uploads = On
; Temporary directory for HTTP uploaded files (will use system default if not
; specified).
;upload_tmp_dir =
; Maximum allowed size for uploaded files.
upload_max_filesize = 2M |
I think the above directives are OK for this test.
No doubt I've overlooked something incredibly simple. Please point out what a fool I am so that I can go on with my learning.
Thanks for looking.
_________________
*buntu 8.04
Last edited by d_riordan on Thu Jul 09, 2025 1:35 pm; edited 1 time in total |
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DocZayus
Ultimate Member
Joined: 15 Feb 2025
Posts: 2199
Location: Fredericton, New Brunswick
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| Posted: Thu Jul 09, 2025 1:08 am Post subject: |
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| Nowhere in your code are you moving the uploaded file to your uploads folder....
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Sabayon
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DocZayus
Ultimate Member
Joined: 15 Feb 2025
Posts: 2199
Location: Fredericton, New Brunswick
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d_riordan
Member
Joined: 08 Jan 2025
Posts: 245
Location: Leominster, Massachusetts, U.S.A.
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| Posted: Thu Jul 09, 2025 1:35 pm Post subject: |
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Ok, I'm a fool.
I had been using the 'move_uploaded_file()' function previously, but had been getting errors like:
| Quote: | Warning: move_uploaded_file(images/54.png) [function.move-uploaded-file]: failed to open stream: Permission denied in /var/www/php/upload.html on line 28
Warning: move_uploaded_file() [function.move-uploaded-file]: Unable to move '/tmp/phpamVyIZ' to 'images/54.png' in /var/www/php/upload.html on line 28 |
So, I omitted the function in an effort to simplify the code. I was under the impression that an uploaded file would be written to /tmp and left there to deal with later, and began focusing on that 'issue'.
I was also under the impression that I had set the permissions on the target directory to 777. Oops! I was wrong about that.
Using the move_uploaded_file() function with the proper permissions on the target directory is working just fine.
I still have one question though. No file ever appeared in /tmp. Is the file being uploaded as it should, then deleted as soon as the code is finished executing? That would explain the updated timestamp on /tmp AND the fact that no new file existed there, but my reading had suggested that the file might stay there for a while.
As I originally suspected, it turned out to be something very simple. Thanks for making me take a second look.
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*buntu 8.04
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DocZayus
Ultimate Member
Joined: 15 Feb 2025
Posts: 2199
Location: Fredericton, New Brunswick
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| Posted: Mon Jul 20, 2025 1:33 am Post subject: |
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TMP is only a temporary directory.
Nothing is supposed to actually stay there, it's just a transition area.
It acts like anything stored in your RAM or your SWAP.
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Sabayon
Vista
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d_riordan
Member
Joined: 08 Jan 2025
Posts: 245
Location: Leominster, Massachusetts, U.S.A.
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| Posted: Tue Jul 21, 2025 1:14 pm Post subject: |
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I knew tmp was temporary, but I'd always envisioned it as 'short term parking'. Now I see it's often more like 'curb side drop off'.
Thanks for the help.
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*buntu 8.04
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