Thuật toán lọc bỏ dấu tiếng Việt trong lập trình PHP

Trong quá trình lập trình, có lúc chúng ta muốn lọc bỏ dấu tiếng Việt. (để tìm kiếm hay để tối ưu hóa link cho dễ xem chả hạn). Thiết Kế Số xin nêu ra một cách để cách để các bạn tham khảo:

Giả sử ta có một chuỗi :
<?
$cs=”Thiết Kế Số là một công ty thiết kế website chuyên nghiệp“;

$marTViet=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”,”Ô,””,”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”);

$marKoDau=array(“a”,”a”,”a”,”a”,”a”,”a”,”a”,”a”,”a”,”a”,”a”
,”a”,”a”,”a”,”a”,”a”,”a”,
“e”,”e”,”e”,”e”,”e”,”e”,”e”,”e”,”e”,”e”,”e”,
“i”,”i”,”i”,”i”,”i”,
“o”,”o”,”o”,”o”,”o”,”o”,”o”,”o”,”o”,”o”,”o”,”o”
,”o”,”o”,”o”,”o”,”o”,
“u”,”u”,”u”,”u”,”u”,”u”,”u”,”u”,”u”,”u”,”u”,
“y”,”y”,”y”,”y”,”y”,
“d”,
“A”,”A”,”A”,”A”,”A”,”A”,”A”,”A”,”A”,”A”,”A”,”A”
,”A”,”A”,”A”,”A”,”A”,
“E”,”E”,”E”,”E”,”E”,”E”,”E”,”E”,”E”,”E”,”E”,
“I”,”I”,”I”,”I”,”I”,
“O”,”O”,”O”,”O”,”O”,”O”,”O”,”O”,”O”,”O”,”O”,”O”
,”O”,”O”,”O”,”O”,”O”,
“U”,”U”,”U”,”U”,”U”,”U”,”U”,”U”,”U”,”U”,”U”,
“Y”,”Y”,”Y”,”Y”,”Y”,
“D”);
echo str_replace($marTViet,$marKoDau,$cs);
?>

đoạn mã trên sẽ in ra màn hình dòng chữ sau:
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