Advent of code 2015/8
Ajax Direct

Answer ⏱

Part 1 : Part 2 : 
// ==================================================
// > PART 1
// ==================================================
$counts = $input->lines->map(function ($line) {
    return [
        $line->length(),
        strlen($line->eval())
    ];
});

$solution_1 = $counts->column(0)->sum() - $counts->column(1)->sum();

// ==================================================
// > PART 2
// ==================================================
$counts = $input->lines->map(function ($line) {
    return [
        $line->length(),
        strlen(addslashes((string) $line)) + 2
    ];
});

$solution_2 = $counts->column(1)->sum() - $counts->column(0)->sum();