php生成翻页链接列表函数

<?php
/**
 * 生成页码列表
 * @param int $element_total_count 元素总数
 * @param int $current_page 当前页
 * @param int $per_page_elem_count 每页元素数
 * @param int $show_page_num 列表显示的页码数
 * @param string $up_class 向上翻页样式
 * @param string $up_text 向上翻页文本
 * @param string $down_class 向下翻页样式
 * @param string $down_text 向下翻页文本
 * @param string $curr_num_class 当前页页码数字样式
 * @param string $href 页面链接
 * @param string $page_symbol 传递页码数的链接参数
 * @param string $a_container_pre a标签外围容器的开始标签
 * @param string $a_container_suf a标签外围容器的结束标签
 *
 * @return string
 */
function getPageListLink($element_total_count, $current_page=1, $per_page_elem_count=10,
        $show_page_num=10, $up_class='', $up_text='上一页', $down_class='', $down_text='下一页', $curr_num_class='',
        $href='', $page_symbol='p', $a_container_pre='', $a_container_suf='')
{
    if(empty($href)) {
        //自动取得剔除页码参数的页面链接
        $page_name = basename($_SERVER['PHP_SELF']);
        $params = $_SERVER['QUERY_STRING'];
        $params_str = '';
        if(!empty($params)) {
            $params = str_replace('&', '&', $params);
            $params_array = explode('&', $params);
            foreach($params_array as $param) {
                if(!empty($param)) {
                    $index = strpos($param, '=');
                    if($index) {
                        $key = substr($param, 0, $index);
                        if($key && $key != $page_symbol)
                            $params_str .= $param . '&';
                    }
                }
            }
        }
        if(!empty($params_str))
            $href = $page_name . '?' . $params_str;
        else
            $href = $page_name;
        $href = rtrim($href,'&');
    }
    $prefix = strpos($href,"?") ? "&" : "?";
    $prefix .= $page_symbol;
    $page_total_count = ceil($element_total_count/$per_page_elem_count);
    if(intval($element_total_count)< 1 || !isset($element_total_count)) {
        return '';
    }
    if($element_total_count <= $per_page_elem_count)
        return '';
    if($current_page>$page_total_count)
        $current_page = 1;
    if(strpos($href,"#")) {
        $label = substr($href,strpos($href,"#"));
        $href = substr($href,0,strpos($href,"#"));
    } else {
    $label = '';
    }
    /* 生成页码 */
    if($current_page > ceil($show_page_num/2)) {
        $start = $current_page - ceil($show_page_num/2);
        $end = (($current_page+ceil($show_page_num/2))<$page_total_count) ?
            $current_page+ceil($show_page_num/2)-1 : $page_total_count;
    } else {
        $start = 1;
        $end = ($show_page_num>$page_total_count) ? $page_total_count : $show_page_num;
    }
    if(!empty($curr_num_class))
        $num_class_str = ' class="'.$curr_num_class.'"';
    else
        $num_class_str = '';
    $page_num_string = '';
    for($i=$start;$i<=$end;$i++) {
        if(intval($i) == intval($current_page))
            $page_num_string .= $a_container_pre.'.$num_class_str.'>'.$i.''.$a_container_suf;
        else
            $page_num_string .= $a_container_pre.'.$href.$prefix.'='.$i.$label.'">'.$i.''.$a_container_suf;
    }
    /* 上下翻页 */
    $prev_page = (intval($current_page-1)>0)?intval($current_page-1):0;
    $next_page = (intval($current_page)<$page_total_count) ? intval($current_page+1) : 0;
    if(!empty($up_class))
        $up_class_str = ' class="'.$up_class.'"';
    else
        $up_class_str = '';
    $page_up_string = '';
    if(intval($prev_page) > 0)
        $page_up_string = $a_container_pre.'.$href.$prefix.'='.$prev_page.$label.'"'.$up_class_str.'>'.$up_text.''.$a_container_suf;
    else
        $page_up_string = $a_container_pre.'.$up_class_str.'>'.$up_text.''.$a_container_suf;
    $page_down_string = '';
    if(!empty($down_class))
        $down_class_str = ' class="'.$down_class.'"';
    else
        $down_class_str = '';
    if(intval($next_page) > 0)
        $page_down_string .= $a_container_pre.'.$href.$prefix.'='.$next_page.$label.'"'.$down_class_str.'>'.$down_text.''.$a_container_suf;
    else
        $page_down_string .= $a_container_pre.'.$down_class_str.'>'.$down_text.''.$a_container_suf;
    return $page_up_string . $page_num_string . $page_down_string;
}