Description:
------------
File upload under Apache 2.2.8 and 2.2.11 produces an empty temporary file name and an UPLOAD_ERR_NO_TMP_DIR error in $_FILES[<userfile>]['error']. In the case of the machine concerned, Apache and PHP run off the D: drive whereas the temporary directories reside under C:.

Rebooting the entire system sometimes resolves the problem temporarily, but it then reappears. This does not always work, however. Repeat "uploads" occasionally cause the server to crash.

Setting the temporary directory explicitly using upload_tmp_dir provides a workaround.

Default windows system tmp dir variables are set as:

TEMP=C:\WINDOWS\TEMP
TMP=C:\WINDOWS\TEMP



Reproduce code:
---------------
<?php
      if (count($_FILES) > 0) { 
        echo "<h1>Response page</h1>";
        echo "<h2>\$_ENV</h2>";
        foreach ($_ENV as $name => $value) echo $name."=".htmlentities($value)."<br/>";
        echo "<h2>\$_FILES</h2>";
        foreach ($_FILES["myFile"] as $fileProperty => $filePropertyValue) {
            echo $fileProperty."=".$filePropertyValue."<br>";
        }
      } else { 
      ?>
        <h1>Form</h1>
        <form action="fu.php" method="post" enctype="multipart/form-data">
          Please enter a file: <input type="file" name="myFile">
          <input type="submit" value="Submit file for processing">
        </form>
      <?php
      }
?>

Expected result:
----------------
$_ENV
...
TEMP=C:\WINDOWS\TEMP
TMP=C:\WINDOWS\TEMP
...

$_FILES
name=figure1-e.pdf
type=application/pdf
tmp_name=C:\WINDOWS\Temp\php981.tmp
error=0
size=50452

Actual result:
--------------
$_ENV
...
TEMP=C:\WINDOWS\TEMP
TMP=C:\WINDOWS\TEMP
...

$_FILES
name=figure1-e.pdf
type=
tmp_name=
error=6
size=0