0xD34F

$newText = preg_replace('~\b\d+:\d+\b~', '<a href="#">$0</a>', $text);

$t = &$arr;

foreach ($keys as $key) {
  if (!isset($t[$key]) || !is_array($t[$key])) {
    $t[$key] = [];
  }

  $t = &$t[$key];
}

$t['value'] = $val;

implode("\n", array_slice(explode("\n", $text), 0, количество_строк))

preg_match('~([^\n]+(\n|$)){0,количество_строк}~', $text, $match)

array_slice($data, $offset)

if ($page <= $size_page) {

array_diff($arrays, [ "none"]); - этот способ Не работает

$newArrays = array_map(fn($arr) => array_diff($arr, [ 'none' ]), $arrays);

$arrs = [ сюда складываете исходные массивы ];

foreach ($arrs as $arr) {
  foreach ($arr as $key => $val) {
    $arrMax[$key] = max($arrMax[$key] ?? -INF, $val);
  }
}

$count = array_count_values(array_map(fn($n) => explode('/', $n['DETAIL_PAGE_URL'])[2], $arr));

preg_match_all('~[\w\-]+(=".*?")?~', $str, $matches);

function getURLs($arr, $path = []) {
  $urls = [];

  foreach ($arr as $item) {
    array_push($path, $item['slug']);
    array_push($urls, '/'.implode('/', $path).'/', ...getURLs($item['children'], $path));
    array_pop($path);
  }

  return $urls;
}

function updateArray(&$array, $keys, $val) {
  $v = &$array;

  foreach ($keys as $k) {
    if (!isset($v[$k])) {
      $v[$k] = [];
    }

    $v = &$v[$k];
  }

  $v = $val;
}

это вообще реально?

foreach ($arr as $item) {
  $id = $item['id_product_attribute'];
  if (!isset($result[$id])) {
    $result[$id] = $item;
  } else {
    $result[$id]['attribute_name'] .= ', '.$item['attribute_name'];
  }
}

$grouped = [];

foreach ($arr as $n) {
  $grouped[$n['city']][] = $n;
}

echo implode('', array_map(function($author, $book) {
  return '<p>Книга '.$book['nameBook'].', ее написал '.$author['fio'].', '.$author['email'].'</p>';
}, $arr['authors'], $arr['books']));

function plainArray($arr, $keys = []) {
  $result = [];

  foreach ($arr as $k => $v) {
    $keys[] = $k;

    $result += is_array($v)
      ? plainArray($v, $keys)
      : [ implode('__', $keys) => $v ];

    array_pop($keys);
  }

  return $result;
}