wp_kses_decode_entities

Converts all numeric HTML entities to their named counterparts.

This function decodes numeric HTML entities (`A` and `A`).
It doesn’t do anything with named entities like `ä`, but we don’t
need them in the allowed URL protocols system anyway.

function wp_kses_decode_entities( $string ) {
	$string = preg_replace_callback( '/&#([0-9]+);/', '_wp_kses_decode_entities_chr', $string );
	$string = preg_replace_callback( '/&#[Xx]([0-9A-Fa-f]+);/', '_wp_kses_decode_entities_chr_hexdec', $string );

	return $string;
}