remove  BOM

http://stackoverflow.com/questions/10290849/how-to-remove-multiple-utf-8-bom-sequences-before-doctype

credits to Jasonhao

//Remove UTF8 Bom

function remove_utf8_bom($text)
{
$bom = pack('H*','EFBBBF');
$text = preg_replace("/^$bom/", '', $text);
return $text;
}