Parameters

$wp_check_filetype_and_ext

(array) 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.

$file

(string) Full path to the file.

$filename

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

$mimes

(string[]) Array of mime types keyed by their file extension regex.

$real_mime

(string|bool) The actual mime type or false if the type cannot be determined.