Advent of code(2022)(php): Day one

edit: I thought this was 2024, IT IS NOT

Day one we are given a set of data grouped by blank lines.
The task is too parse the data, add the arrays and find the top three values.

My Advent of code Repo

1000
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7000
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10000

<?php

$puzzle_input = file("day_1.txt");

$elves = array();
$elves_total = array();
$blank = 0;

foreach ($puzzle_input as $line){
    $line = str_replace("\n", "", $line);

    if(empty($line)){
        $blank++;
    }else{
        $schema = "elf_".$blank;

        if(empty($elves[$schema])){
            $elves[$schema][0] = $line;
        }else{
            $elves[$schema][] = $line;
        }
    }
}

foreach ($elves as $elf => $calories){
    $total = 0;
    foreach ($calories as $calorie){
        $total = $total + $calorie;
    }
    $elves_total[$elf] = $total;
}

function sortElves($a, $b)
{
    return $b <=> $a;
}

uasort($elves_total, "sortElves");

print("part one: ".$elves_total[array_keys($elves_total)[0]]);
print("\n");

$top_three_total = $elves_total[array_keys($elves_total)[0]] + $elves_total[array_keys($elves_total)[1]] + $elves_total[array_keys($elves_total)[2]];
print("part two: ".$top_three_total);
print("\n");