Hàm PHP xử lý dấu tiếng Việt

1/function RemoveSign($str)
{
$coDau=array("à","á","ạ","ả","ã","â","ầ","ấ","ậ","ẩ","ẫ","ă","ằ","ắ"
,"ặ","ẳ","ẵ","è","é","ẹ","ẻ","ẽ","ê","ề","ế","ệ","ể","ễ","ì","í","ị","ỉ","ĩ",
"ò","ó","ọ","ỏ","õ","ô","ồ","ố","ộ","ổ","ỗ","ơ"
,"ờ","ớ","ợ","ở","ỡ",
"ù","ú","ụ","ủ","ũ","ư","ừ","ứ","ự","ử","ữ",
"ỳ","ý","ỵ","ỷ","ỹ",
"đ",
"À","Á","Ạ","Ả","Ã","Â","Ầ","Ấ","Ậ","Ẩ","Ẫ","Ă"
,"Ằ","Ắ","Ặ","Ẳ","Ẵ",
"È","É","Ẹ","Ẻ","Ẽ","Ê","Ề","Ế","Ệ","Ể","Ễ",
"Ì","Í","Ị","Ỉ","Ĩ",
"Ò","Ó","Ọ","Ỏ","Õ","Ô","Ồ","Ố","Ộ","Ổ","Ỗ","Ơ"
,"Ờ","Ớ","Ợ","Ở","Ỡ",
"Ù","Ú","Ụ","Ủ","Ũ","Ư","Ừ","Ứ","Ự","Ử","Ữ",
"Ỳ","Ý","Ỵ","Ỷ","Ỹ",
"Đ","ê","ù","à");
$khongDau=array("a","a","a","a","a","a","a","a","a","a","a"
,"a","a","a","a","a","a",
"e","e","e","e","e","e","e","e","e","e","e",
"i","i","i","i","i",
"o","o","o","o","o","o","o","o","o","o","o","o"
,"o","o","o","o","o",
"u","u","u","u","u","u","u","u","u","u","u",
"y","y","y","y","y",
"d",
"A","A","A","A","A","A","A","A","A","A","A","A"
,"A","A","A","A","A",
"E","E","E","E","E","E","E","E","E","E","E",
"I","I","I","I","I",
"O","O","O","O","O","O","O","O","O","O","O","O"
,"O","O","O","O","O",
"U","U","U","U","U","U","U","U","U","U","U",
"Y","Y","Y","Y","Y",
"D","e","u","a");
return str_replace($coDau,$khongDau,$str);
}

2/function khongdau($str) {
$str = preg_replace("/(à|á|ạ|ả|ã|â|ầ|ấ|ậ|ẩ|ẫ|ă|ằ|ắ|ặ|ẳ|ẵ)/", 'a', $str);
$str = preg_replace("/(è|é|ẹ|ẻ|ẽ|ê|ề|ế|ệ|ể|ễ)/", 'e', $str);
$str = preg_replace("/(ì|í|ị|ỉ|ĩ)/", 'i', $str);
$str = preg_replace("/(ò|ó|ọ|ỏ|õ|ô|ồ|ố|ộ|ổ|ỗ|ơ|ờ|ớ|ợ|ở|ỡ)/", 'o', $str);
$str = preg_replace("/(ù|ú|ụ|ủ|ũ|ư|ừ|ứ|ự|ử|ữ)/", 'u', $str);
$str = preg_replace("/(ỳ|ý|ỵ|ỷ|ỹ)/", 'y', $str);
$str = preg_replace("/(đ)/", 'd', $str);
$str = preg_replace("/(À|Á|Ạ|Ả|Ã|Â|Ầ|Ấ|Ậ|Ẩ|Ẫ|Ă|Ằ|Ắ|Ặ|Ẳ|Ẵ)/", 'A', $str);
$str = preg_replace("/(È|É|Ẹ|Ẻ|Ẽ|Ê|Ề|Ế|Ệ|Ể|Ễ)/", 'E', $str);
$str = preg_replace("/(Ì|Í|Ị|Ỉ|Ĩ)/", 'I', $str);
$str = preg_replace("/(Ò|Ó|Ọ|Ỏ|Õ|Ô|Ồ|Ố|Ộ|Ổ|Ỗ|Ơ|Ờ|Ớ|Ợ|Ở|Ỡ)/", 'O', $str);
$str = preg_replace("/(Ù|Ú|Ụ|Ủ|Ũ|Ư|Ừ|Ứ|Ự|Ử|Ữ)/", 'U', $str);
$str = preg_replace("/(Ỳ|Ý|Ỵ|Ỷ|Ỹ)/", 'Y', $str);
$str = preg_replace("/(Đ)/", 'D', $str);
//$str = str_replace(" ", "-", str_replace("&*#39;","",$str));
return $str;

3/var ca = new Array (\"a\",\"à.á.ạ.ả.ã.â.ầ.ấ.ậ.ẩ.ẫ.ă.ằ.ắ.ặ.ẳ.ẵ.À.Á.Ạ.Ả.Ã.Â.Ầ.Ấ.Ậ.Ẩ.Ẫ.Ă.Ằ.Ắ.Ặ.Ẳ.Ẵ\"); var ce = new Array (\"e\",\"è.é.ẹ.ẻ.ẽ.ê.ề.ế.ệ.ể.ễ.È.É.Ẹ.Ẻ.Ẽ.Ê.Ề.Ế.Ệ.Ể.Ễ\"); var ci = new Array (\"i\",\"ì.í.ị.ỉ.ĩ.Ì.Í.Ị.Ỉ.Ĩ\");
var co = new Array (\"o\",\"ò.ó.ọ.ỏ.õ.ô.ồ.ố.ộ.ổ.ỗ.ơ.ờ.ớ.ợ.ở.ỡ.Ò.Ó.Ọ.Ỏ.Õ.Ô.Ồ.Ố.Ộ.Ổ.Ỗ.Ơ.Ờ.Ớ.Ợ.Ở.Ỡ\");
var cu = new Array (\"u\",\"ù.ú.ụ.ủ.ũ.ư.ừ.ứ.ự.ử.ữ.Ù.Ú.Ụ.Ủ.Ũ.Ư.Ừ.Ứ.Ự.Ử.Ữ\");
var cy = new Array (\"y\",\"ỳ.ý.ỵ.ỷ.ỹ.Ỳ.Ý.Ỵ.Ỷ.Ỹ\");
var cd = new Array (\"d\",\"đ.Đ\");
var cs = new Array (\"\",\"\\\\\\\\\\\\\\'.~.@.#.%.^.&\");
var bangkitucoso = new Array(ca,ce,ci,co,cu,cy,cd,cs);
function mLocDau(bv) { var markhongdau = new Array();
markhongdau[0]=bv; for (j=0; j < bangkitucoso.length; j++)
// max j = 8 { marthaythe = bangkitucoso[j][1].split(\\\\\\\\\\\\\\'.\\\\\\\\\\\\\\');
// tach cac chuoi co dau thanh tung phan tu rieng biet for (i=0; i < marthaythe.length; i++) { markhongdau[i+1] = mThayThe(markhongdau[i],marthaythe[i],bangkitucoso[j][0]); markhongdau[0]=markhongdau[i+1].toLowerCase(); } }
//end of for
// kiem tra loi injection
// document.getElementById(\\\\\\\\\\\\\\'uoon\\\\\\\\\\\\\\').innerHTML =markhongdau[0]; return markhongdau[0]; }
// ham nay co chuc nang tuong tu nhu str_replace trong php function mThayThe(ccha,cbithay,cthaythe) { var ccon = \"/\" + cbithay +\"/gi\"; var cmoi=ccha.replace(eval(ccon),cthaythe); return cmoi;}


4/function make_title_furl($text){
//global $ibforums;
//Charachters must be in ASCII and certain ones aint allowed
$text = html_entity_decode ($text);
$text = preg_replace("/(ä|à|á|ạ|ả|ã|â|ầ|ấ|ậ|ẩ|ẫ|ă|ằ|ắ|ặ|ẳ|ẵ)/", 'a', $text);
$text = str_replace("ç","c",$text);
$text = preg_replace("/(è|é|ẹ|ẻ|ẽ|ê|ề|ế|ệ|ể|ễ)/", 'e', $text);
$text = preg_replace("/(ì|í|î|ị|ỉ|ĩ)/", 'i', $text);
$text = preg_replace("/(ö|ò|ó|ọ|ỏ|õ|ô|ồ|ố|ộ|ổ|ỗ|ơ|ờ|ớ|ợ|ở|ỡ)/", 'o', $text);
$text = preg_replace("/(ü|ù|ú|ụ|ủ|ũ|ư|ừ|ứ|ự|ử|ữ)/", 'u', $text);
$text = preg_replace("/(ỳ|ý|ỵ|ỷ|ỹ)/", 'y', $text);
$text = preg_replace("/(đ)/", 'd', $text);
//CHU HOA
$text = preg_replace("/(Ä|À|Á|Ạ|Ả|Ã|Â|Ầ|Ấ|Ậ|Ẩ|Ẫ|Ă|Ằ|Ắ|Ặ|Ẳ|Ẵ)/", 'A', $text);
$text = str_replace("Ç","C",$text);
$text = preg_replace("/(È|É|Ẹ|Ẻ|Ẽ|Ê|Ề|Ế|Ệ|Ể|Ễ)/", 'E', $text);
$text = preg_replace("/(Ì|Í|Ị|Ỉ|Ĩ)/", 'I', $text);
$text = preg_replace("/(Ö|Ò|Ó|Ọ|Ỏ|Õ|Ô|Ồ|Ố|Ộ|Ổ|Ỗ|Ơ|Ờ|Ớ|Ợ|Ở|Ỡ)/", 'O', $text);
$text = preg_replace("/(Ü|Ù|Ú|Ụ|Ủ|Ũ|Ư|Ừ|Ứ|Ự|Ử|Ữ)/", 'U', $text);
$text = preg_replace("/(Ỳ|Ý|Ỵ|Ỷ|Ỹ)/", 'Y', $text);
$text = preg_replace("/(Đ)/", 'D', $text);
//Special string
$text = preg_replace("/( |!|"|#|$|%|')/", '', $text);
$text = preg_replace("/(̀|́|̉|$|>)/", '', $text);
$text = preg_replace ("'<[\/\!]*?[^<>]*?>'si", "", $text);
/*
$text = str_replace(" / ","-",$text);
$text = str_replace("/","-",$text);
$text = str_replace(" - ","-",$text);
$text = str_replace("_","-",$text);
$text = str_replace(" ","-",$text);
$text = str_replace( "ß", "ss", $text);
$text = str_replace( "&", "", $text);
$text = str_replace( "%", "", $text);
$text = ereg_replace("[^A-Za-z0-9-]", "", $text);
*/
$text = str_replace("----","-",$text);
$text = str_replace("---","-",$text);
$text = str_replace("--","-",$text);
return $text;
}