WordPress at a glance
filter is not described

wp_check_filetype_and_ext filter-hook . WP 3.0.0

Filters the "real" file type of the given file.


add_filter( 'wp_check_filetype_and_ext', 'filter_function_name_3285', 10, 5 );
function filter_function_name_3285( $wp_check_filetype_and_ext, $file, $filename, $mimes, $real_mime ){
	// filter...

	return $wp_check_filetype_and_ext;
File data array containing 'ext', 'type', and 'proper_filename' keys.
Full path to the file.
The name of the file (may differ from $file due to $file being in a tmp directory).
Key is the file extension with value as the mime type.
The actual mime type or false if the type cannot be determined.


  • Since 5.1.0 The $real_mime parameter was added.

Where the hook is called

wp-includes/functions.php 2651
return apply_filters( 'wp_check_filetype_and_ext', compact( 'ext', 'type', 'proper_filename' ), $file, $filename, $mimes, $real_mime );

Where the hook is used (in WP core)

Does not used.