apply_filters( ‘wp_check_filetype_and_ext’, array $wp_check_filetype_and_ext, string $file, string $filename, string[]|null $mimes, string|false $real_mime )

Parameters

$wp_check_filetype_and_extarray

Values for the extension, mime type, and corrected filename.

• ext string|false
  File extension, or false if the file doesn’t match a mime type.
• type string|false
  File mime type, or false if the file doesn’t match a mime type.
• proper_filename string|false
  File name with its correct extension, or false if it cannot be determined.

$filestring

Full path to the file.

$filenamestring

The name of the file (may differ from $file due to $file being in a tmp directory).

$mimesstring[]|null

Array of mime types keyed by their file extension regex, or null if none were provided.

$real_mimestring|false

The actual mime type or false if the type cannot be determined.