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wp_handle_upload_prefilter

apply_filters( ‘wp_handle_upload_prefilter’, array $file )

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Filter data for the current file to upload.

Parameters

$filearray
An array of data for a single file.

More Information

When you upload Media from your WordPress admin dashboard, wp_handle_upload is called once for each file the user specified. wp_handle_upload_prefilter is an admin filter that is called by the wp_handle_upload function. The single parameter, $file, represent a single element of the $_FILES array. The wp_handle_upload_prefilter provides you with an opportunity to examine or alter the filename before the file is moved to its final location.

Using this, in conjunction with the upload_dir, you can dynamically determine which directory to upload to, based on the files you upload.

add_filter('wp_handle_upload_prefilter', 'custom_upload_filter' );

function custom_upload_filter( $file ) {
$file['name'] = 'wordpress-is-awesome-' . $file['name'];
return $file;
}

Source

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Changelog

VersionDescription
2.9.0Introduced.

User Contributed Notes

  1. Skip to note 5 content
    David Aguilera
    You must log in to vote on the helpfulness of this noteVote results for this note: 4You must log in to vote on the helpfulness of this note

    Example: Prevent images larger than 200kb from being uploaded.

    function plugin_prefix_max_image_size( $file ) {
  $limit    = 200;
  $size     = $file['size'] / 1024;
  $is_image = strpos( $file['type'], 'image' ) !== false;
  if ( $is_image && $size > $limit ) {
    $file['error'] = "Image files must be smaller than {$limit}kb";
  }
  return $file;
}
add_filter( 'wp_handle_upload_prefilter', 'plugin_prefix_max_image_size' );
  3. Skip to note 7 content
    Jules Colle
    You must log in to vote on the helpfulness of this noteVote results for this note: -1You must log in to vote on the helpfulness of this note

    Example: prepend all uploaded files with wordpress-is-awesome-

    add_filter( 'wp_handle_upload_prefilter', function( $file ) {
    $file['name'] = 'wordpress-is-awesome-' . $file['name'];
    return $file;
} );

    (According to https://wordpress.stackexchange.com/a/333935/5986 this code was originally in the docs. I’m adding it here again since I can’t find it anywhere else.)

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