New update on slugify
DROP FUNCTION IF EXISTS `slugify`;
DELIMITER ;;
CREATE DEFINER=CURRENT_USER
FUNCTION `slugify`(dirty_string varchar(200))
RETURNS varchar(200) CHARSET latin1
DETERMINISTIC
BEGIN
DECLARE x, y , z, i Int;
Declare temp_string, allowed_chars, new_string VarChar(200);
Declare is_allowed Bool;
Declare c, check_char VarChar(1);
set i = 0;
set allowed_chars = "abcdefghijklmnopqrstuvwxyz0123456789-";
set temp_string = LOWER(dirty_string);
Select temp_string Regexp('&') Into x;
If x = 1 Then
Set temp_string = replace(temp_string, '&', ' and ');
End If;
Select temp_string Regexp('[^a-z0-9]+') into x;
If x = 1 then
set z = 1;
While z <= Char_length(temp_string) Do
Set c = Substring(temp_string, z, 1);
Set is_allowed = False;
Set y = 1;
Inner_Check: While y <= Char_length(allowed_chars) Do
If (strCmp(ascii(Substring(allowed_chars,y,1)), Ascii(c)) = 0) Then
Set is_allowed = True;
Leave Inner_Check;
End If;
Set y = y + 1;
End While;
If is_allowed = False Then
Set temp_string = Replace(temp_string, c, '-');
End If;
set z = z + 1;
End While;
End If;
Select temp_string Regexp("^-|-$|'") into x;
If x = 1 Then
Set temp_string = Replace(temp_string, "'", '');
Set z = Char_length(temp_string);
Set y = Char_length(temp_string);
Dash_check: While z > 1 Do
If Strcmp(SubString(temp_string, -1, 1), '-') = 0 Then
Set temp_string = Substring(temp_string,1, y-1);
Set y = y - 1;
Else
Leave Dash_check;
End If;
Set z = z - 1;
End While;
End If;
Repeat
Select temp_string Regexp("--") into x;
If x = 1 Then
Set temp_string = Replace(temp_string, "--", "-");
End If;
Until x <> 1 End Repeat;
If LOCATE('-', temp_string) = 1 Then
Set temp_string = SUBSTRING(temp_string, 2);
End If;
SELECT COUNT(*) INTO i FROM fanpage WHERE slug LIKE CONCAT(temp_string,'%');
If i > 0 Then
Set temp_string = CONCAT(temp_string,'-',i+1);
End If;
Return temp_string;
END;;
DELIMITER ;
P.S: change "fanpage" to your own table - this is to prevent duplicate on slug
credit goes to http://nastyhabit.wordpress.com/2008/09/25/mysql-slug-maker-function-aka-the-slugifier/