Dynamic associative Array - list, count, sum, min, max - php

Question

I've got an array with about 40 keys. I'd like to have a small function that returns a summary array.
Right now I've got the following that works:
foreach ($all_data as $value){
$new_array[ $value['location'] ][ $value['manufacturer'] ][ $value['model'] ] += 1;
}
This returns an array with everything I need. However, the location, manufacturer and model could be changed up for a bunch of other values.
what I am trying to do is have something simple as:
$new_array = summarize($all_data,array('location','manufacturer','model','count'),array('list','list','list','count') );}
where this summarize function would build the call. I think I just need a bit of help on how to get it to run the string as code for this array. Otherwise I get
$current_selection = "[ $row_item['location'] ][ $row_item['manufacturer'] ][ $row_item['model'] ]"
$return_array{$current_selection} += 1;
Where the end goal is to have a function like:
function summarize($data_array, $fields_array, $process_array){
//data_array = associative multi-dimensional data array
//fields = values to pull from the data_array
//process = array specifying whether to list, sum, count, average, max, min
$return_array = array();
$current_selection = "";
foreach($fields_array as $field){
$current_selection .= '[ $row_item[\'' . $field . '\'] ]';
}
foreach ($data_array as $row_item){
//dynamic = DOES NOT WORK
$return_array[$current_selection] += 1;//eval? create function? abstract?
//another attempt
${'return_array' . $current_selection} += 1;
//Manual = Does work
//$return_array[ $row_item['location'] ][ $row_item['manufacturer'] ][ $row_item['model'] ] += 1;
}
}
Thanks for any help on how to do an indirect reference.
JC
RESOLUTION
The final version that managed to resolve this looks like the following, thanks to user: check, for getting me on the correct path.
function summarize($data_array, $fields_array, $process_array){
$return_array = array();
$i = 0;
foreach ($data_array as $row){
$ii = 0;
$temp = array();
$temp2 = array();
foreach($fields_array as $key=>$field){
if($process_array[$ii] == 'list') $temp[$ii] = $row[$field];
if($process_array[$ii] == 'count') $temp2[$ii] = 1;
if($process_array[$ii] == 'sum') $temp2[$ii] = $row[$field];
$ii++;
}
$unique = true;
$ii = 0;
foreach($return_array as $row2){
if(array_intersect_key($row2,$temp) == $temp){//$row2 == $temp){
$unique = false;
break;
}
$ii++;
}
if($unique){
$return_array[$i] = $temp;
if(!empty($temp2)) $return_array[$i] = array_merge($temp,$temp2);
$i++;
}else{
if(!empty($temp2)){
foreach($temp2 as $key => $value){
if($process_array[$key] == 'sum') $temp2[$key] = $return_array[$ii][$key] + $value;
if($process_array[$key] == 'count') $temp2[$key] = $return_array[$ii][$key] + 1;
if($process_array[$key] == 'max') $temp2[$key] = ($return_array[$ii][$key] < $value) ? $value : $return_array[$ii][$key];
if($process_array[$key] == 'min') $temp2[$key] = ($return_array[$ii][$key] > $value) ? $value : $return_array[$ii][$key];
//TODO:(JC) 'average' - need to create a count field if not present (or always despite and assume overhead of extra computations).
// - then just calculate the 'sum' and divide by the counter as a last step before returning the array.
}
$return_array[$ii] = array_merge($temp,$temp2);
}
}
}
print_r($return_array);
return $return_array;
}
Which gives the following result:
/*
CALL: summarize($data,array('location','manufacturer','model','model','volume','colourvolume'),array('list','list','list','count','sum','sum') );
[0] = location
[1] = manufacturer
[2] = model
[3] = model count
[4] = mono volume sum
[5] = colour volume sum
*/
Array
(
[0] => Array
(
[0] =>
[1] => HP
[2] => LaserJet 4000
[3] => 3
[4] => 3000
[5] => 0
)
...
[17] => Array
(
[0] => Room 114
[1] => CANON
[2] => iR3235
[3] => 1
[4] => 4012
[5] => 0
)
[18] => Array
(
[0] => Room 115
[1] => LEXMARK
[2] => T652
[3] => 1
[4] => 20
[5] => 0
)
)

Answer 1

alternatively, if I assume that's $field_array contains sequentially key fields from root to sub key, you can loop your $field_array within $data_array loop
function summarize($data_array, $fields_array, $process_array){
$return_array = array();
foreach ($data_array as $row){
$temp = array();
foreach($fields_array as $key=>$field){
$temp = $key==0?$row[$field]:$temp[$field];
}
if(!empty($temp)) $return_array[] = $temp;
}
return $return_array;
}
and this is my array, will summarize with these function
$array = array(
array("multi"=>array("dimensional"=>array("array"=>"foo1"))),
array("multi"=>array("dimensional"=>array("array"=>"foo2"))),
array("multi"=>array("dimensional"=>array("array"=>"foo3"))),
array("multi"=>array("dimensional"=>array("array"=>"foo4"))),
array("multi"=>array("dimensional"=>array("array"=>"foo5"))),
array("multi"=>array("dimensional"=>array("array"=>"foo6"))),
array("multi"=>array("dimensional"=>array("array"=>"foo7"))),
array("multi"=>array("dimensional"=>array("array"=>"foo8"))),
array("multi"=>array("dimensional"=>array("array"=>"foo9")))
);
print_r(summarize($array,array("multi","dimensional","array"),NULL));
Ouput
Array ( [0] => foo1 [1] => foo2 [2] => foo3 [3] => foo4 [4] => foo5 [5] => foo6 [6] => foo7 [7] => foo8 [8] => foo9 )