Simple Pagination in PHP

simple-pagination.php

/**
 * Simple Pagination function with range dots
 * Based on https://gist.github.com/kottenator/9d936eb3e4e3c3e02598
 * All credits go to https://gist.github.com/kottenator
 *
 * @param $curPage
 * @param $lastPage
 * @param int $delta
 * @return array
 */
function pagination($curPage, $lastPage, $delta = 2) {
    $left = $curPage - $delta;
    $right = $curPage + $delta + 1;
    $range = [];
    $rangeWithDots = [];

    for ($i = 1; $i <= $lastPage; $i++) {
        if ($i == 1 || $i == $lastPage || ($i >= $left && $i < $right)) {
            $range[] = $i;
        }
    }

    $l = null;
    foreach ($range as $i) {
        if ($l) {
            if ($i - $l === 2) {
                $rangeWithDots[] = $l + 1;
            } elseif ($i - $l !== 1) {
                $rangeWithDots[] = '...';
            }
        }
        $rangeWithDots[] = $i;
        $l = $i;
    }

    return $rangeWithDots;
}