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How to find all permutation of a String by allow user input text or number

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Hi all dear
can anyone help me how to find all permutation of a String by allow user input text or number and generate when user click on button,

user need to input text on number in input box and click generate button to show result of all permutation of a String
below is code i found from https://www.journaldev.com/526/permutation-of-string-in-java
but it's not allow user input text,

please help me in php function
thank with best regard


<!DOCTYPE html>
function generatePermutation($string,$start,$end){ if($start == $end-1){ echo "$string - "; } else{ for($i = $start; $i < $end; $i++){ $temp = $string[$start]; $string[$start] = $string[$i]; $string[$i] = $temp; generatePermutation($string,$start+1,$end); $temp = $string[$start]; $string[$start] = $string[$i]; $string[$i] = $temp; } }
$str = "ABC";
$n = strlen($str);
echo "All the permutations of the string are: ";


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10 hours ago, NotSunfighter said:

You need to generate an HTML page with an INPUT for the user generated string then use a JAVASCRIPT function called Ajax to transfer user input to your PHP function and transfer the permutations back to JS to show them.

Thank you so much for your reply,


can you help me with code, i don't know how to do it,

please kindly help me with example code please dear

thank with best regard 

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Here a solution from Stackoverflow

<!DOCTYPE html>
<html lang="en">

var permArr = [],
  usedChars = [];
str = [5,3,7,1];
function permute(input) {
  var i, ch;
  for (i = 0; i < input.length; i++) {
    ch = input.splice(i, 1)[0];
    if (input.length == 0) {
    input.splice(i, 0, ch);
  return permArr

document.write(JSON.stringify(permute(str)));  STACKOVERFLOW


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