[PHP]頁面連接函式

//一面多少個資料
$results_per_page = 50;
//多少個頁面
$num_pages = ceil(count($friend['data'])/$results_per_page);
//當前頁面
$cur_page = isset($_GET['page']) ? $_GET['page'] : 1;
//定位該頁面的第一筆資料
$skip = (($cur_page - 1 )*$results_per_page);

$friends=array();
//一次只拿50個資料
$friends = array_slice($friend['data'],$skip,$results_per_page);

//------------------------------------------------------------
function generate_page_links($cur_page, $num_pages) {
$page_links = '';
$before = $cur_page - 4;
$after = $cur_page + 4;
($before < 1 ? $before=1:'');
($after > $num_pages ? $after = $num_pages:'');

// If this page is not the first page, generate the "previous" link
if ($cur_page > 1) {
$page_links .= '<a href="' . $_SERVER['PHP_SELF'] .  '?page=' . ($cur_page - 1) . '"><-</a> ';
}
else {
$page_links .= '<- ';
}

// Loop through the pages generating the page number links
for ($before; $before <= $after ;$before++) {
if ($cur_page == $before) {
$page_links .= ' ' . $before;
}
else {
$page_links .= ' <a href="' . $_SERVER['PHP_SELF'] . '?page=' . $before . '"> ' . $before . '</a>';
}
}

// If this page is not the last page, generate the "next" link
if ($cur_page < $after) {
$page_links .= ' <a href="' . $_SERVER['PHP_SELF'] . '?page=' . ($cur_page + 1) . '">-></a>';
}
else {
$page_links .= ' ->';
}

return $page_links;
}