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There is a charset parameter in htmlspecialchars but the decode version does not have it. In comparison to the similar htmlentities, the encode and decode functions both have the charset parameter. So I can’t choose what charset I am decoding back to?
htmlspecialchars()requires the charset parameter only when converting charsets who’s special characters are not in the ‘default’ positions. Hence, charsets ISO-8859-1, ISO-8859-15, UTF-8, cp866, cp1251, cp1252, and KOI8-R do not require the charset parameter.htmlspecialchars_decode()converts entities (& " ' < >) back to their character equivalent and therefore does not need to be passed a charset.As
htmlentities()converts ‘all’ characters to their equivalent entity, a charset can be passed inhtml_entity_decode()to ensure the entities are decoded to the relevant character in the charset.