How right replace value element in array?

Question

I want to compare the key values ​​in the array and if a match is found to increase the value of the element.

For this I use code:

// var_dump $all_a         


        

Answer 1

You need to majke $elms a reference. By default it will be a copy of the sub-array, so assignment won't update the original array.

$all_array = array(array("art_7880", "Арт.7880", "1", NULL, "png", 1372269755),
                   array("art_7880", "Арт.7880", "1", NULL, "png", 1372269874));
$count = array("10", "1");
$product = array("1372269755", "1372269874");

$count = array("10", "1");
$product = array("1372269755", "1372269874");
$count_arr_products = count($product);
for($i=0; $i<$count_arr_products; $i++){ // Use < not <=
  foreach ($all_array as $keys => &$elms) { // Use a reference so we can update it
    if ($product[$i]==$elms[5]){
      if ($count[$i] > 0) {
        $elms[2] = $count[$i];
      } else {
        unset($all_array[$keys]); // not unset($keys)
      }
    }
  }
}
var_dump($all_array);

Output:

array(2) {
  [0]=>
  array(6) {
    [0]=>
    string(8) "art_7880"
    [1]=>
    string(11) "Арт.7880"
    [2]=>
    string(2) "10"
    [3]=>
    NULL
    [4]=>
    string(3) "png"
    [5]=>
    int(1372269755)
  }
  [1]=>
  &array(6) {
    [0]=>
    string(8) "art_7880"
    [1]=>
    string(11) "Арт.7880"
    [2]=>
    string(1) "1"
    [3]=>
    NULL
    [4]=>
    string(3) "png"
    [5]=>
    int(1372269874)
  }
}