Symfony 3.4: get value and sum Variable variable array values - php

Question

Forgive the word game.
I have to cycle an array and sum the values, then multiply for the price (i already know how to do that).
The object is composed of 64 fields called val1, val2, val3 etc .. each field has a simple_array with the value of the quantity.
I get these data from the database using doctrine.
$item = $this->getDoctrine()->getRepository(ExpertationsAdvanced::class)->findBy(['father' => $id]);
dump($item[0]->getVal1());
for($i = 1; $i < 64; $i++) {
dump(${'$item[0]->getVal' . $i . '()'});
$i++;
if(${'$item[0]->getVal' . $i . '()'} == null) {
$return = '0';
} else {
$return = array_sum(${'$item[0]->getVal' . $i . '()'} );
}
dump($return);
}
the first dump return the array i'm requesting for, with no problems, but in the forloop, i get erro Notice: Undefined variable: $item[0]->getVal1().
I think I'm using the wrong logic but maybe worked so mutch time and can't see a way.

Answer 1

First of all if you have 64 fields, you should have(read docs for more info):
for($i = 1; $i <= 64; $i++) {
Secondary, you don't need to increment $i inside of loop
$i++;
To get the value:
$item[0]->{"getVal{$i}"}();
// OR
$method = "getVal{$i}";
$item[0]->$method();
Result will be:
for($i = 1; $i <= 64; $i++) {
$array = $item[0]->{"getVal{$i}"}();
$return = is_array($array) ? array_sum($array) : 0;
dump($return);
}