paginator

gistfile1.txt

<?php

class PaginatorException extends Exception
{
    public const NO_PAGE_COUNT = 'No total page count';
    public const NO_URL = 'No URL set';
    public const NO_URL_PART = 'No URL part set';
    public const NO_CURRENT_PAGE = 'No current page count';
}

class Paginator
{
    private $currentPage = 1;
    private $customNext;
    private $customPrev;
    private $pageCount;
    private $pagerSize = 5;
    private $url;
    private $urlPart;

    /**
     * @param int $pageNum
     * @return string
     */
    private function url(int $pageNum): string
    {
        return str_replace($this->urlPart, $pageNum, $this->url);
    }

    /**
     * @param $pageCount
     */
    public function setPagecount($pageCount): void
    {
        $this->pageCount = $pageCount;
    }

    /**
     * @param $url
     */
    public function setUrl($url): void
    {
        $this->url = $url;
    }

    /**
     * @param $replace
     */
    public function setUrlPart($replace): void
    {
        $this->urlPart = $replace;
    }

    /**
     * @param int $page_no
     */
    public function setCurrentPage(int $page_no): void
    {
        $this->currentPage = $page_no;
    }


    /**
     * @param $url
     */
    public function setCustomPrev($url): void
    {
        $this->customPrev = '<a href="' . $url . '/"><i class="icon-backward"></i></a>';
    }


    /**
     * @param $url
     */
    public function setCustomNext(string $url)
    {
        $this->customNext = '<a href="' . $url . '/"><i class="icon-forward"></i></a>';
    }

    /**
     * @param int $numBoxes an ODD number!
     */
    public function setPagerSize(int $numBoxes): void
    {
        if ($numBoxes % 2 === 0) {
            $numBoxes--;
        }
        $this->pagerSize = $numBoxes;
    }

    /**
     * @return int
     */
    public function getPagerSize(): int
    {
        if (!$this->pagerSize) {
            $this->pagerSize = 5;
        }
        return $this->pagerSize;
    }

    /**
     * @return string
     * @throws PaginatorException
     */
    public function render(): string
    {
        if (!$this->pageCount) {
            throw new PaginatorException(PaginatorException::NO_PAGE_COUNT);
        }

        if (!$this->url) {
            throw new PaginatorException(PaginatorException::NO_URL);
        }

        if (!$this->urlPart) {
            throw new PaginatorException(PaginatorException::NO_URL_PART);
        }

        if (!$this->currentPage) {
            throw new PaginatorException(PaginatorException::NO_CURRENT_PAGE);
        }

        $html = '<nav><ul class="pagination">';

        if ($this->pageCount > ($this->getPagerSize() - 1)) {
            $pages = $this->getPagerSize();
            $half = ($pages - 1) / 2;
            if ($this->currentPage === 1) {
                $start = 1;
            } elseif ($this->currentPage === 2) {
                $start = 1;
            } elseif ($this->currentPage >= ($this->pageCount - $half)) {
                $start = $this->pageCount - ($this->getPagerSize() - 1);
            } else {
                $start = $this->currentPage - $half;
                if ($start < 1) {
                    $start = 1;
                }
            }
        } else {
            $pages = $this->pageCount;
            $start = 1;
        }

        $html .= ($start === 1) ? '<li class="page-item disabled">' :'<li class="page-item">';
        if (isset($this->customPrev)) {
            $html .= $this->customPrev;
        } elseif ($start === 1) {
            $html .= '<a class="page-link"  href ="#"><i class="icon-backward icon-disabled"></i></a>';
        } else {
            $html .= '<a class="page-link"  href ="' . $this->url(1) . '"><i class="icon-backward icon-active"></i></a>';
        }
        $html .= '</li>';

        for ($x = $start; $x <= ($start + ($pages - 1)); $x++) {
            $html .= '<li class="page-item ';
            if ($this->currentPage === $x) {
                $html .= ' active" aria-current="page';
            }
            $html .= '">';
            if ($this->currentPage === $x) {
                $html .= '<a class="page-link" href="#">' . $x . '</a>';
            } else {
                $html .= '<a class="page-link" href="' . $this->url($x) .'">' . $x . '</a>';
            }
            $html .= '</li>';
        }

        $html .= (($start + ($pages - 1)) >= $this->pageCount) ? '<li class="page-item disabled">' :'<li class="page-item">';

        if (isset($this->customNext)) {
            $html .= $this->customNext;
        } elseif (($start + ($pages - 1)) >= $this->pageCount) {
            $html .= '<span><i class="icon-forward icon-disabled"></i></span>';
        } else {
            $html .= '<a class="page-link"  href ="' . $this->url($this->pageCount) . '"><i class="icon-forward icon-active"></i></a>';
        }
        $html .= '</li>';
        $html .= '</ul></nav>';

        return $html;
    }
}

$page = $_GET['page'] ?: 1;
$pager = new Paginator();
$pager->setCurrentPage($page);
$pager->setPagerSize(7);
$pager->setPagecount(15);
$pager->setUrl('http://dev.marshsat2.emea.mrshmc.com/dmclean2/cleva/be/sip/test.php?page=:page');
$pager->setUrlPart(':page');
?>
<html>
<head>
    <link rel="stylesheet" href="//stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
</head>
<body>
<?= $pager->render() ?>
</body>
</html>