PHP array of all permutations, elements of all combinations of methods, PHP arrays _php Tutorial

PHP array of all permutations, elements of all combinations of methods, PHP arrays

In this paper, we describe the method of all the combinations of elements in the PHP array. Share to everyone for your reference, as follows:

<?php$source = Array (' PLL ', ' I ', ' love ', ' You ', ' hey '); sort ($source); Ensure that the initial array is ordered $last = count ($source)-1; $source tail element subscript $x = $last; $count = 1; Combined number of statistics echo implode (', ', $source), "
"; Output the first combination while (true) {  $y = $x--;//two elements adjacent  if ($source [$x] < $source [$y]) {//If the value of the previous element is less than the value of the next element    $z = $la St;    while ($source [$x] > $source [$z]) {//start at the tail, find the first value greater than $x element      $z--;    }    /* Swap values for $x and $z elements */    list ($source [$x], $source [$z]) = Array ($source [$z], $source [$x]);    /* The elements after the $y are all reversed *    /for ($i = $last; $i > $y; $i--, $y + +) {      list ($source [$i], $source [$y]) = Array ($source [ $y], $source [$i]);    }    echo implode (', ', $source), "
"; Output combination    $x = $last;    $count + +;  }  if ($x = = 0) {//all combinations complete break    ;  }} Echo ' total: ', $count, ' \ n ';? >

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