_canonical_charset() WP 3.6.0

Retrieve a canonical form of the provided charset appropriate for passing to PHP functions such as htmlspecialchars() and charset HTML attributes.

No Hooks.

Return

String. The canonical form of the charset.

Usage

_canonical_charset( $charset );

$charset(string) (required)

A charset name.

Notes

• See: https://core.trac.wordpress.org/ticket/23688

Changelog

Code of _canonical_charset() canonical charset ^{WP 5.7}

<?php
function _canonical_charset( $charset ) {
	if ( 'utf-8' === strtolower( $charset ) || 'utf8' === strtolower( $charset ) ) {

		return 'UTF-8';
	}

	if ( 'iso-8859-1' === strtolower( $charset ) || 'iso8859-1' === strtolower( $charset ) ) {

		return 'ISO-8859-1';
	}

	return $charset;
}