Combination of letters using php

// function to generate and print all N! permutations of $str. (N = strlen($str)).
function permute($str,$i,$n) {
if ($i == $n)
print "$str\n";
else {
for ($j = $i; $j < $n; $j++) {
swap($str,$i,$j);
permute($str, $i+1, $n);
swap($str,$i,$j); // backtrack.
}
}
}

// function to swap the char at pos $i and $j of $str.
function swap(&$str,$i,$j) {
$temp = $str[$i];
$str[$i] = $str[$j];
$str[$j] = $temp;
}

$str = "sad";
permute($str,0,strlen($str)); // call the function.

sad sda asd ads das dsa

Tagged in:

• combination
• PHP
• permutation
• letters