Drupal 7 – Handling file uploads
When trying to deal with custom forms with file upload fields, you may sometimes get a error regarding extensions:
The specified file “your file name here” could not be uploaded. Only files with the following extensions are allowed: “jpg jpeg gif png txt doc xls pdf ppt pps odt ods odp”
To allow all extensions, you have to manually set the ‘file_validate_extensions’ validator to an empty array.
e.g.
For more information, check out Drupal API’s documentation at http://api.drupal.org/api/drupal/includes–file.inc/function/file_save_upload/7
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