apply_filters( "{$action}_prefilter", array $file )

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

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(array) 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.

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File: wp-admin/includes/file.php

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Version Description
4.0.0 Converted to a dynamic hook with $action.
2.9.0 Introduced.

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