From:             chris at dented-planet dot net
Operating system: Mac OS X 10.4.10
PHP version:      5.2.4RC1
PHP Bug Type:     Unknown/Other Function
Bug description:  Change in File Upload Behavior

Description:
------------
I don't know if this is considered a bug there there has been a change in
behavior in the File Upload handling when uploading a zero-length file.

The change happened after PHP 5.2.2 and is in 5.2.4RC1 as well.

Note: I am not using a debug build.


Reproduce code:
---------------
Use this code to upload a zero-length file (I used Firefox 1.5.x):

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";>
<html xmlns="http://www.w3.org/1999/xhtml"; xml:lang="en-US">
<head></head>
<body>
<form method="post" action="<?php echo $_SERVER['PHP_SELF'] ?>"
enctype="multipart/form-data">
<input type="file" name="upload_file" />
<br />
<input type="submit" name="submit" value="Submit" />
</form>
<br />
<pre>
<?php
var_dump($_FILES);
?>
</pre>
</body>
</html>


Expected result:
----------------
In PHP 5.2.2, the output of var_dump($_FILES) is:

array(1) {
  ["upload_file"]=>
  array(5) {
    ["name"]=>
    string(9) "empty.txt"
    ["type"]=>
    string(10) "text/plain"
    ["tmp_name"]=>
    string(18) "/var/tmp/phpLAvnSB"
    ["error"]=>
    int(0)
    ["size"]=>
    int(0)
  }
}

In PHP 5.2.3 and later it is:

array(1) {
  ["upload_file"]=>
  array(5) {
    ["name"]=>
    string(9) "empty.txt"
    ["type"]=>
    string(0) ""
    ["tmp_name"]=>
    string(0) ""
    ["error"]=>
    int(5)
    ["size"]=>
    int(0)
  }
}

Especially, notice the change in "error".


-- 
Edit bug report at http://bugs.php.net/?id=42280&edit=1
-- 
Try a CVS snapshot (PHP 4.4): 
http://bugs.php.net/fix.php?id=42280&r=trysnapshot44
Try a CVS snapshot (PHP 5.2): 
http://bugs.php.net/fix.php?id=42280&r=trysnapshot52
Try a CVS snapshot (PHP 6.0): 
http://bugs.php.net/fix.php?id=42280&r=trysnapshot60
Fixed in CVS:                 http://bugs.php.net/fix.php?id=42280&r=fixedcvs
Fixed in release:             
http://bugs.php.net/fix.php?id=42280&r=alreadyfixed
Need backtrace:               http://bugs.php.net/fix.php?id=42280&r=needtrace
Need Reproduce Script:        http://bugs.php.net/fix.php?id=42280&r=needscript
Try newer version:            http://bugs.php.net/fix.php?id=42280&r=oldversion
Not developer issue:          http://bugs.php.net/fix.php?id=42280&r=support
Expected behavior:            http://bugs.php.net/fix.php?id=42280&r=notwrong
Not enough info:              
http://bugs.php.net/fix.php?id=42280&r=notenoughinfo
Submitted twice:              
http://bugs.php.net/fix.php?id=42280&r=submittedtwice
register_globals:             http://bugs.php.net/fix.php?id=42280&r=globals
PHP 3 support discontinued:   http://bugs.php.net/fix.php?id=42280&r=php3
Daylight Savings:             http://bugs.php.net/fix.php?id=42280&r=dst
IIS Stability:                http://bugs.php.net/fix.php?id=42280&r=isapi
Install GNU Sed:              http://bugs.php.net/fix.php?id=42280&r=gnused
Floating point limitations:   http://bugs.php.net/fix.php?id=42280&r=float
No Zend Extensions:           http://bugs.php.net/fix.php?id=42280&r=nozend
MySQL Configuration Error:    http://bugs.php.net/fix.php?id=42280&r=mysqlcfg

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