Dino Winchester

<form action="receive_data.php" method="post">
  <input name="username">
  <button type="submit">Send</button>
</form>

<?php

$name = $_POST['username'];
$to      = 'nobody@example.com';
$subject = 'the subject';
$message = 'hello '.$name;
$headers = 'From: webmaster@example.com';
mail($to, $subject, $message, $headers);

header('Location: /other_page.php');

button {
  height: 64px;
  width: 256px;
  border-top-left-radius: 5px 50%;
  border-top-right-radius: 5px 50%;
  border-bottom-left-radius: 5px 50%;
  border-bottom-right-radius: 5px 50%;
  border: none;
}

function search(nums, target, searchMin) {
  for (let iMin = 0, iMax = nums.length - 1; iMin <= iMax; ) {
    const index = (iMin + iMax) / 2 | 0;
    const num = nums[index];

    if (num === target && num !== nums[index + (searchMin ? -1 : 1)]) {
      return index;
    } else if (num <= target - (searchMin ? 1 : 0)) {
      iMin = index + 1;
    } else {
      iMax = index - 1;
    }
  }

  return -1;
}

function searchMinMax(nums, target) {
  const iMin = search(nums, target, true);
  return iMin === -1
    ? []
    : [ iMin, search(nums, target, false) ];
}

почему ошибку выдает?

It should take an array of numbers as its argument and return the two highest numbers within the array.

function twoOldestAges($ages) {
  sort($ages);
  return array_slice($ages, -2);
}

function twoOldestAges($ages) {
  $a = -INF;
  $b = -INF;

  foreach ($ages as $n) {
    if ($n > $a) {
      $b = $a;
      $a = $n;
    } else if ($n > $b) {
      $b = $n;
    }
  }
  
  return [ $b, $a ];
}

str.split(/(?<=\S)\s*(?=[А-ЯЁ])/).join(' ')

// или

str.replace(/(?<=\S)(?=[А-ЯЁ])/g, ' ')

// или

str.replace(/(\S)(?=[А-ЯЁ])/g, '$1 ')

// или

str.replace(/[А-ЯЁ]/g, (m, i) => i && str[~-i] !== ' ' ? ' ' + m : m)

function count(min, max) {
  let counter = 0;
  for (let n = min; n <= max; n++) {
    if (!n.toString(10).includes('5')) counter++;
  }
  return counter;
}

count(4, 17)  // 12

.block {
  background-image: url('image.jpg');
}
@media (max-width: 700px) {
  .block {
    background-image: url('image-small.jpg');
  }
}

const computed = results.reduce(
    (acc, item) => (item.data.forEach(({ name, value }) => (acc[name] = (acc[name] ?? 0) + value)), acc),
    {}
);
const personInfo = {
    labels: Object.keys(computed),
    values: Object.values(computed)
};

const result = arr.flat();

// или

const result = Array.prototype.concat.apply([], arr);

// или

const result = arr.reduce((acc, n) => (acc.push(...n), acc), []);

// или

const result = [];

for (const n of arr) {
  for (const m of n) {
    result[result.length] = m;
  }
}

async function() {
  let result = null;

  while (1) {
    result = await fetch(...);

    if (result тот, который нужен) {
      break;
    }

    await new Promise(r => setTimeout(r, 5000));
  }

  return result;
}