bp_document_ajax_check_file_mime_type()

function bp_document_ajax_check_file_mime_type() {
	$response = array();
	if ( isset( $_POST ) && isset( $_POST['action'] ) && 'bp_document_check_file_mime_type' === $_POST['action'] && ! empty( $_FILES ) ) {
		$files = $_FILES;
		foreach ( $files as $input => $info_arr ) {

			$finfo            = finfo_open( FILEINFO_MIME_TYPE );
			$real_mime        = finfo_file( $finfo, $info_arr['tmp_name'] );
			$info_arr['type'] = $real_mime;
			foreach ( $info_arr as $key => $value_arr ) {
				$response[ $key ] = $value_arr;
			}
		}
	}
	wp_send_json_success( $response );
}