This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness. Use https://core.trac.wordpress.org/ticket/23688 instead.

_canonical_charset( string $charset )

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

Description

See also

Parameters

$charset

(string) (Required) A charset name.

Return

(string) The canonical form of the charset.

Source

File: wp-includes/functions.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;
}

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Changelog

Changelog
Version Description
WP-3.6.0 Introduced.