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

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

$charset string Required

A charset name.

string The canonical form of the charset.

File: wp-includes/functions.php. View all references

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;
}