mb_check_encoding Check if the string is valid for the specified encoding &reftitle.description; boolmb_check_encoding stringvar stringencoding mb_check_encoding checks if the string is valid for the specified encoding. It is useful to prevent so-called "Invalid Encoding Attack". &reftitle.parameters; var String to check. If it is omitted, this function checks all the input from the beginning of the request. encoding Expected encoding. &reftitle.returnvalues; &return.success;