The easiest way is to set up the translation table as follows:
$translation = array( 'from' => array( 'à','á','â','ã','ä', 'ç', 'è','é','ê','ë', 'ì','í','î','ï', 'ñ', 'ò','ó','ô','õ','ö', 'ù','ú','û','ü', 'ý','ÿ', 'À','Á','Â','Ã', 'Ä','Ç', 'È','É','Ê','Ë', 'Ì','Í','Î','Ï', 'Ñ', 'Ò','Ó','Ô','Õ', 'Ö', 'Ù','Ú','Û','Ü', 'Ý') 'to' => array( 'a','a','a','a','a', 'c', 'e','e','e','e', 'i','i','i','i', 'n', 'o','o','o','o','o', 'u','u','u','u', 'y','y', 'A','A','A','A','A', 'C','E','E','E','E', 'I','I','I','I', 'N', 'O','O','O','O','O', 'U','U','U','U', 'Y') );
and then you can use strtr to translate in byte order:
$string = strtr("Camion",$translation['from'],$translation['to']);
after which everything should be in the English az AZ range.
If your server supports iconv , you can do something like this:
$string = iconv("UTF-8", "ISO-8859-1//TRANSLIT", $string);