apply_filters( “{$action}_prefilter”, array $file )

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Filters the data for a file before it is uploaded to WordPress.


The dynamic portion of the hook name, $action, refers to the post action.

Possible hook names include:

  • wp_handle_sideload_prefilter
  • wp_handle_upload_prefilter


Reference to a single element from $_FILES.
  • name string
    The original name of the file on the client machine.
  • type string
    The mime type of the file, if the browser provided this information.
  • tmp_name string
    The temporary filename of the file in which the uploaded file was stored on the server.
  • size int
    The size, in bytes, of the uploaded file.
  • error int
    The error code associated with this file upload.


$file = apply_filters( "{$action}_prefilter", $file );


4.0.0Converted to a dynamic hook with $action.

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