Сравнение производительности и использования ресурсов strict и non-strict кода на PHP7.4 и PHP8 для рандомного массива и его пузырьковой сортировки.

buble.php

<?php
$count = 1000;
$minNumber = 0;
$maxNumber = 666;

$array = getRandomNumbers($count, $minNumber, $maxNumber);

$sorter = new BubbleSorter($array);
$sortedArray = $sorter->sort();
echo implode(' ', $sortedArray) . PHP_EOL;

function getRandomNumbers($count, $min, $max)
{
    $generator = new NumberGenerator($min, $max);

    return $generator->getNumbers($count)->getResult();
}

class NumberGenerator
{
    private $min;
    private $max;

    private $result = [];

    public function __construct($min, $max)
    {
        $this->min = $min;
        $this->max = $max;
    }

    public function getNumbers($count)
    {
        $this->result = [];

        if (!empty($count)) {
            for ($i = 0; $i < $count; $i++) {
                $this->result[] = random_int($this->min, $this->max);
            }
        }

        return $this;
    }

    public function getResult()
    {
        return $this->result;
    }
}

class BubbleSorter
{
    private $array = [];

    public function __construct($array)
    {
        $this->array = $array;
    }

    public function sort()
    {
        if (!empty($this->array)) {
            do {
                $swapped = false;

                for ($i = 0, $count = count($this->array) - 1; $i < $count; $i++) {
                    if ($this->array[$i] > $this->array[$i + 1]) {
                        list($this->array[$i + 1], $this->array[$i]) = [$this->array[$i], $this->array[$i + 1]];
                        $swapped = true;
                    }
                }
            } while($swapped);
        }

        return $this->array;
    }
}

superBuble.php

<?php
declare(strict_types = 1);

(int) $count = 1000;
(int) $minNumber = 0;
(int) $maxNumber = 100;

(array) $array = getRandomNumbers($count, $minNumber, $maxNumber);
echo implode(' ', $array) . PHP_EOL;

(object) $sorter = new BubbleSorter($array);
(array) $sortedArray = $sorter->sort();
echo implode(' ', $sortedArray) . PHP_EOL;

function getRandomNumbers(int $count, int $min, int $max) : array
{
    (object) $generator = new NumberGenerator($min, $max);

    return $generator->getNumbers($count)->getResult();
}

class NumberGenerator
{
    private int $min;
    private int $max;

    private array $result = [];

    public function __construct(int $min, int $max)
    {
        $this->min = $min;
        $this->max = $max;
    }

    public function getNumbers(int $count) : self
    {
        $this->result = [];

        if (!empty($count)) {
            for ((int) $i = 0; $i < $count; $i++) {
                $this->result[] = random_int($this->min, $this->max);
            }
        }

        return $this;
    }

    public function getResult() : array
    {
        return $this->result;
    }
}

class BubbleSorter
{
    private array $array = [];

    public function __construct(array $array)
    {
        $this->array = $array;
    }

    public function sort() : array
    {
        if (!empty($this->array)) {
            do {
                (bool) $swapped = false;

                for ((int) $i = 0, (int) $count = count($this->array) - 1; $i < $count; $i++) {
                    if ($this->array[$i] > $this->array[$i + 1]) {
                        list($this->array[$i + 1], $this->array[$i]) = [$this->array[$i], $this->array[$i + 1]];
                        $swapped = true;
                    }
                }
            } while($swapped);
        }

        return $this->array;
    }
}