Massivlar

// Har bir misol qat'iy turlar rejimida ishlaydi.

// Indeksli - kalitlar 0 dan boshlanadi
$shaharlar = ["Toshkent", "Namangan", "Samarqand"];

// Assotsiativ - kalitlar o'zingiz beradigan satrlar
$aholi = [
    "Toshkent"   => 2900000,
    "Namangan"   => 650000,
    "Samarqand"  => 560000,
];

echo "Indeksli massiv:\n";
foreach ($shaharlar as $kalit => $qiymat) {
    echo "  [{$kalit}] => {$qiymat}\n";
}

echo "\nAssotsiativ massiv:\n";
foreach ($aholi as $shahar => $son) {
    printf("  %-12s %12s\n", $shahar, number_format($son, 0, ",", " "));
}

echo "\n";
echo "Aralash ham mumkin (lekin tavsiya etilmaydi):\n";
$aralash = ["a", "kalit" => "qiymat", "b"];
foreach ($aralash as $k => $v) {
    echo "  " . var_export($k, true) . " => {$v}\n";
}

$vazifalar = [];

// Oxiriga qo'shish
$vazifalar[] = "Hisobotni yozish";
$vazifalar[] = "Xatga javob berish";
array_push($vazifalar, "Uchrashuvga tayyorlanish");

// Boshiga qo'shish
array_unshift($vazifalar, "SHOSHILINCH: serverni tekshirish");

echo "Ro'yxat (" . count($vazifalar) . " ta):\n";
foreach ($vazifalar as $i => $v) {
    echo "  " . ($i + 1) . ". {$v}\n";
}

echo "\n";
$oxirgi = array_pop($vazifalar);
echo "array_pop olib tashladi:   {$oxirgi}\n";

$birinchi = array_shift($vazifalar);
echo "array_shift olib tashladi: {$birinchi}\n";

echo "\nQolgan: " . count($vazifalar) . " ta\n";
foreach ($vazifalar as $i => $v) {
    echo "  [{$i}] {$v}\n";
}

$ruxsatlar = ["o'qish", "yozish", "o'chirish"];
$narxlar = ["non" => 4000, "sut" => 12500, "shakar" => 9800];

printf("%-38s %s\n", "in_array('yozish'):", in_array("yozish", $ruxsatlar, true) ? "ha" : "yo'q");
printf("%-38s %s\n", "in_array('boshqarish'):", in_array("boshqarish", $ruxsatlar, true) ? "ha" : "yo'q");

echo "\n";
printf("%-38s %s\n", "array_key_exists('sut'):", array_key_exists("sut", $narxlar) ? "ha" : "yo'q");
printf("%-38s %s\n", "isset(\$narxlar['sut']):", isset($narxlar["sut"]) ? "ha" : "yo'q");

echo "\n";
$joy = array_search("o'chirish", $ruxsatlar, true);
echo "array_search o'rni: " . var_export($joy, true) . "\n";
$yoq = array_search("boshqarish", $ruxsatlar, true);
echo "Topilmasa qaytaradi: " . var_export($yoq, true) . "\n";

echo "\n";
echo "Kalitlar: " . implode(", ", array_keys($narxlar)) . "\n";
echo "Qiymatlar: " . implode(", ", array_values($narxlar)) . "\n";
echo "12500 ga mos kalit: " . array_search(12500, $narxlar, true) . "\n";

$mahsulotlar = [
    ["nom" => "Klaviatura", "narx" => 350000,  "soni" => 3],
    ["nom" => "Sichqoncha", "narx" => 120000,  "soni" => 10],
    ["nom" => "Monitor",    "narx" => 2400000, "soni" => 2],
    ["nom" => "Quloqchin",  "narx" => 89000,   "soni" => 0],
];

// map - har biriga jami summani qo'shamiz
$hisoblangan = array_map(
    static fn(array $m): array => $m + ["jami" => $m["narx"] * $m["soni"]],
    $mahsulotlar
);

echo "Barcha mahsulotlar:\n";
foreach ($hisoblangan as $m) {
    printf("  %-12s %2d dona  %12s\n", $m["nom"], $m["soni"],
           number_format($m["jami"], 0, ",", " "));
}

// filter - faqat omborda borlarini qoldiramiz
$mavjud = array_values(array_filter(
    $hisoblangan,
    static fn(array $m): bool => $m["soni"] > 0
));

echo "\nOmborda bor: " . count($mavjud) . " ta\n";

// reduce - umumiy qiymatni hisoblaymiz
$umumiy = array_reduce(
    $mavjud,
    static fn(int $yigindi, array $m): int => $yigindi + $m["jami"],
    0
);

echo "Ombor qiymati: " . number_format($umumiy, 0, ",", " ") . " so'm\n";

// array_column - bitta ustunni ajratib olish
$nomlar = array_column($mavjud, "nom");
echo "Nomlar: " . implode(", ", $nomlar) . "\n";

// array_column kalit bilan - juda qulay
$narxJadvali = array_column($mahsulotlar, "narx", "nom");
echo "\nNarx jadvali:\n";
foreach ($narxJadvali as $nom => $narx) {
    printf("  %-12s %12s\n", $nom, number_format($narx, 0, ",", " "));
}

$baholar = ["Malika" => 88, "Husanboy" => 94, "Nodira" => 76, "Aziza" => 94];

$nusxa = $baholar;
arsort($nusxa);           // qiymat bo'yicha kamayish, kalit saqlanadi
echo "Ball bo'yicha (yuqoridan):\n";
foreach ($nusxa as $ism => $ball) {
    printf("  %-10s %d\n", $ism, $ball);
}

$nusxa = $baholar;
ksort($nusxa);            // kalit bo'yicha
echo "\nAlifbo bo'yicha:\n";
echo "  " . implode(", ", array_keys($nusxa)) . "\n";

echo "\n";
// usort - o'z qoidangiz bilan, ko'p mezonli saralash
$talabalar = [
    ["ism" => "Malika",   "ball" => 88, "yosh" => 20],
    ["ism" => "Husanboy", "ball" => 94, "yosh" => 25],
    ["ism" => "Aziza",    "ball" => 94, "yosh" => 22],
    ["ism" => "Nodira",   "ball" => 76, "yosh" => 21],
];

usort($talabalar, static function (array $a, array $b): int {
    // Avval ball bo'yicha kamayish tartibida
    $farq = $b["ball"] <=> $a["ball"];
    // Ball teng bo'lsa - yosh bo'yicha o'sish tartibida
    return $farq !== 0 ? $farq : ($a["yosh"] <=> $b["yosh"]);
});

echo "Ko'p mezonli saralash:\n";
foreach ($talabalar as $t) {
    printf("  %-10s ball %d, yosh %d\n", $t["ism"], $t["ball"], $t["yosh"]);
}

$guruhlar = [
    "KI-21" => [
        ["ism" => "Malika", "ball" => 88],
        ["ism" => "Nodira", "ball" => 76],
    ],
    "KI-22" => [
        ["ism" => "Husanboy", "ball" => 94],
        ["ism" => "Aziza",    "ball" => 91],
        ["ism" => "Kamola",   "ball" => 83],
    ],
];

foreach ($guruhlar as $guruh => $talabalar) {
    $ballar = array_column($talabalar, "ball");
    $ortacha = array_sum($ballar) / count($ballar);

    printf("%s (%d talaba, o'rtacha %.2f)\n", $guruh, count($talabalar), $ortacha);
    foreach ($talabalar as $t) {
        printf("    %-10s %d\n", $t["ism"], $t["ball"]);
    }
}

echo "\n";
// Barcha talabalarni bitta ro'yxatga yig'ish
$hammasi = array_merge(...array_values($guruhlar));
echo "Jami talabalar: " . count($hammasi) . "\n";

$engYaxshi = array_reduce(
    $hammasi,
    static fn(?array $eng, array $t): array =>
        $eng === null || $t["ball"] > $eng["ball"] ? $t : $eng
);
echo "Eng yuqori ball: {$engYaxshi['ism']} ({$engYaxshi['ball']})\n";