Mysqlmakeslugfunction

DROP FUNCTION IF EXISTS `slugify`;DELIMITER ;;CREATE DEFINER=CURRENT_USERFUNCTION `slugify`(dirty_string varchar(200))RETURNS varchar(200) CHARSET latin1DETERMINISTICBEGIN	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 ;