Filter values from array

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.

split each string into array of chars - str_split()
sort each of the subarrays - sort
array_unique each subarray
implode each subarray

Hi,

Thanks for the idea and this is what I got but is not generating what I want.


$abc=str_split($Array[$i]); 
sort($abc);
array_unique($abc);
$xyz = implode(",", $abc);
echo "$xyz";

Results generated : 1,11,21,31,41,22,22,32,41,32,33,33,41,42,43,44,4

But I am expecting something like this : 12,13,14,23,24,34 …

Can you please advise which part I have done wrong or missed ? Thank you.

Full script for your reference :


<?
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>"; 
 
$abc=str_split($Array[$i]); 
sort($abc);
array_unique($abc);
$xyz = implode(",", $abc);
echo "$xyz";

} 
?>



Sorry, my advice was off.


$new = array();
for($i=0 ; $i < count($Array) ; $i++) {

    $abc=str_split($Array[$i]);
    sort($abc);
    $new[] = implode("", $abc);

}
$new = array_unique($new);