Hi,
I have another working function here and need some advise from some experts to make the final piece work.
<?
function permutations($letters,$num){
$last = str_repeat($letters{0},$num);
$result = array();
while($last != str_repeat(lastchar($letters),$num)){
$result[] = $last;
$last = char_add($letters,$last,$num-1);
}
$result[] = $last;
return $result;
}
function char_add($digits,$string,$char){
if($string{$char} <> lastchar($digits)){
$string{$char} = $digits{strpos($digits,$string{$char})+1};
return $string;
}else{
$string = changeall($string,$digits{0},$char);
return char_add($digits,$string,$char-1);
}
}
function lastchar($string){
return $string{strlen($string)-1};
}
function changeall($string,$char,$start = 0,$end = 0){
if($end == 0) $end = strlen($string)-1;
for($i=$start;$i<=$end;$i++){
$string{$i} = $char;
}
return $string;
}
$number = '1234';
$digit = 2;
$Array=permutations($number,$digit);
for($i=0 ; $i < count($Array) ; $i++) {
echo $Array[$i] . "<BR>";
}
?>
The function above works fine but how can I remove all the results from the same numbers (permutation)
e.g : 12, 21, then only show 12 … same goes to the others like 24, 42 then only show 24 without any repetition of the same digit.
Thanks.