DoNiFF

// Массив из которого надо получить значения по SKU
$arr = [
    ["sku" => '1',  "name" => '1111', "price" => '1111'],
    ["sku" => '2',  "name" => '2222', "price" => '2222'],
    ["sku" => '3',  "name" => '3333', "price" => '3333'],
    ["sku" => '4',  "name" => '4444', "price" => '4444'],
    ["sku" => '5',  "name" => '5555', "price" => '5555'],
    ["sku" => '6',  "name" => '6666', "price" => '6666'],
    ["sku" => '7',  "name" => '7777', "price" => '7777'],
    ["sku" => '8',  "name" => '8888', "price" => '8888'],
    ["sku" => '9',  "name" => '9999', "price" => '9999'],
    ["sku" => '10', "name" => '1010', "price" => '1010'],
    ["sku" => '11', "name" => '1111', "price" => '1111'],
    ["sku" => '12', "name" => '1212', "price" => '1212'],
    ["sku" => '13', "name" => '1313', "price" => '1313'],
    ["sku" => '14', "name" => '1414', "price" => '1414'],
    ["sku" => '15', "name" => '1515', "price" => '1515'],
    ["sku" => '16', "name" => '1616', "price" => '1616'],
    ["sku" => '17', "name" => '1717', "price" => '1717'],
    ["sku" => '18', "name" => '1818', "price" => '1818']
  ];
  
  // Массив с нужными SKU
  $torgPred = ['3','5','7','11','18'];
  
  // Новый массив состоящий из нужных SKU, NAME, PRICE
  $newArr = [];

  for($i = 0; $i < count($torgPred); $i++)
  {
    foreach($arr as $value)
    {
        if($torgPred[$i] == $value["sku"])
        {
            $newArr[] = $value;
        }
    }
  }

  echo "<pre>";
  print_r($newArr);
  echo "</pre>";