WordPress at a glance
function is not described

_wp_iso_convert() WP 3.1.0

Helper function to convert hex encoded chars to ASCII

No Hooks.

Return

String. Converted chars

Usage

_wp_iso_convert( $match );
$match(array) (required)
The preg_replace_callback matches array

Changelog

Since 3.1.0 Introduced.

Code of wp iso convert: wp-includes/formatting.php WP 5.2.2

<?php
function _wp_iso_convert( $match ) {
	return chr( hexdec( strtolower( $match[1] ) ) );
}