Description:
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The documentation for the UPLOAD_ERR_EXTENSION file upload error is 
rather unclear and can imply that the upload failed due to the file 
extension, which is incorrect.


Suggested (terse) rewording:

Value: 8; A PHP extension stopped the file upload. Introduced in PHP 
5.2.0.


A more verbose rewording (albeit one that might muddy the waters more 
than it helps):

Value: 8; A PHP extension stopped the file upload. PHP does not 
provide a way to ascertain which extension caused the file upload to 
stop; examining the list of loaded extensions with phpinfo() may help. 
Introduced in PHP 5.2.0.