Print segitiga Angka bolak balik

segitiga-angka.php

<?php

class Segitiga
{
    private $limit;

    public function setLimit($limit)
    {
        $this->limit = $limit;
    }

    public function printSegitigaAtas()
    {
        for ($i = 1; $i < $this->limit; $i++) {
            for ($j = ($this->limit - $i); $j >= 0; $j--) {
                echo ' ';
            }

            $flag = true;
            $temp = $i;
            while ($flag) {
                if (0 !== $temp && -1 !== $temp) {
                    echo abs($temp);
                }
                $temp--;
                if ($temp + 1 === -1 * $i) {
                    $flag = false;
                }
            }

            echo PHP_EOL;
        }
    }

    public function printSegitigaBawah()
    {
        for ($i = $this->limit; $i > 0; $i--) {
            for ($j = ($this->limit - $i); $j >= 0; $j--) {
                echo ' ';
            }

            $flag = true;
            $temp = $i;
            while ($flag) {
                if (0 !== $temp && -1 !== $temp) {
                    echo abs($temp);
                }
                $temp--;
                if ($temp + 1 === -1 * $i) {
                    $flag = false;
                }
            }

            echo PHP_EOL;
        }
    }
}

$segitiga = new Segitiga();
$segitiga->setLimit(7);
$segitiga->printSegitigaAtas();
$segitiga->printSegitigaBawah();