php - create another multi dimensional array from an array -

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suppose have array 

$x= ('a'=>31, 'b'=>12, 'c'=>13, 'd'=>25, 'e'=>18, 'f'=>10);

i need generate array this

$newx = (0 => array('a'=>31 , 'b' =>1) , 1 => array('b'=>11 , 'c' =>13 , 'd'=>8) , 2 =>array('d'=>17 , 'e'=>15) , 3=>array('e'=>3,'f'=>10);

now in case each value of $newx has = 32 , how work $x[a] = 31 , $x[b] = 12 first of have make sum quantity 32 keeping index same new array i.e 

array(0=>array('a'=>31,'b'=>1) , 1=>array('b'=>11) )

the process should continue each value of $x.

while i'm pretty sure homework assignment , well, should provide code of own, @ least try to, found thing amusing went ahead , gave try. guess i'll downvoted , deserve it, here goes anyway.

what need is:

  1. loop through array,
  2. determine elements give 32 , store result in final array.
  3. subtract value of last element result corresponding element of working array
  4. shrink array next deleting first elements until first element of array you're still working equals last element last result returned.
  5. if last result < 32, quit.

with in mind, please try find solution first , don't copy-paste code? :)

<?php  $x = array('a'=>31, 'b'=>12, 'c'=>13, 'd'=>25, 'e'=>18, 'f'=>10); $result = array();   function calc($towalk){ // walk through array until have gathered enough 32, return result   array $result = array();  foreach($towalk $key => $value){     $count = array_sum($result);     if($count >= 32){         // if have more 32, subtract overage last array element         $last = array_pop(array_keys($result));         $result[$last] -= ($count - 32);         return $result;       }     $result[$key] = $value; } return $result;  }   // logic match first element $last = 'a'; // loop long have array while(count($x) > 0){  /*  make sure first element matches last element of found array if last 1 went -> c start @ c , not @ b */ $keys = array_keys($x); if($last == $keys[0]){     // sub-array     $partial = calc($x);     // determine last key used, it's our new starting point     $last = array_pop(array_keys($partial));     $result[] = $partial;                 //subtract last (partial) value used corresponding key in working array             $x[$last] -= $partial[$last];      if(array_sum($partial) < 32) break; } /*      reduce array in size 1, dropping first element     should our resulting first element not match returned     $last element logic jump place again ,     cut off element */ $x = array_slice($x , 1 ); }  print_r($result);

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