如何在php分页中显示前3页和后3页

<?php
// 假设以下变量已经定义：
$totalPages = 10; // 总页数
$currentPage = 5; // 当前页数

// 计算前3页和后3页的页码
$prevPages = [];
$nextPages = [];

if ($currentPage <= 3) {
    $prevPages = range(1, min($totalPages, 3));
} elseif ($currentPage >= $totalPages - 3) {
    $nextPages = range(max(1, $totalPages - 2), $totalPages);
} else {
    $prevPages = range($currentPage - 1, $currentPage + 1);
    $nextPages = range($currentPage + 1, $currentPage + 3);
}

// 生成分页导航链接
echo '<ul class="pagination">';
// 显示前一页链接
if ($currentPage > 1) {
    echo '<li><a href="?page=' . ($currentPage - 1) . '">上一页</a></li>';
} else {
    echo '<li class="disabled"><span>上一页</span></li>';
}

// 显示首页链接
if ($currentPage > 3) {
    echo '<li><a href="?page=1">1</a></li>';
    echo '<li class="disabled"><span>...</span></li>';
}

// 显示前3页链接
foreach ($prevPages as $page) {
    echo '<li><a href="?page=' . $page . '">' . $page . '</a></li>';
}

// 显示当前页链接
echo '<li class="active"><span>' . $currentPage . '</span></li>';

// 显示后3页链接
foreach ($nextPages as $page) {
    echo '<li><a href="?page=' . $page . '">' . $page . '</a></li>';
}

// 显示尾页链接
if ($currentPage < $totalPages - 3) {
    echo '<li class="disabled"><span>...</span></li>';
    echo '<li><a href="?page=' . $totalPages . '">' . $totalPages . '</a></li>';
}

// 显示下一页链接
if ($currentPage < $totalPages) {
    echo '<li><a href="?page=' . ($currentPage + 1) . '">下一页</a></li>';
} else {
    echo '<li class="disabled"><span>下一页</span></li>';
}

echo '</ul>';
?>