PHP碎码——分页类
写了两个版本，还是后面好点，只计算关键数据，返回数组，html代码例外拼接
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entry_total = (int)$entry_total;
$this->page_size = (int)$page_size;
$this->page_count = ceil($entry_total/$page_size);
//分页栏的长度取用户提交的分页栏长度与页面总数中的较小值
$this->page_li_count = $page_li_count > $this->page_count ? $this->page_count : $page_li_count;
}
/**
* 设置当前页及active状态
* @param unknown $page 合法参数为：first end 1234
*/
public function setPage($page){
if ($page == 'end') {
$this->active = 'end';
$this->page = $this->getPagecount();
}elseif ($page>0 && $page<=$this->page_count) {
$this->active = $page;
$this->page = $page;
}else{ //first或传递非法值的会被定到首页去
$this->active = 'first';
$this->page = 1;
}
}
/**
*
* @param unknown $url //该url末尾必需带有？或者&
*/
public function setURL($url){
$this->url = $url;
}
//当前页码
public function getPage(){
return $this->page;
}
//共计多少页
public function getPagecount(){
return $this->page_count;
}
//共计多少条记录
public function getEntrycount(){
return $this->entry_total;
}
/**
* 计算当前页的分页栏需要的信息
* @return 返回数组，包含拼接分页关键信息
*/
public function create(){
//首页
$first_page= "first";
//计算上页页码，最小为1
$pre_page = ($this->page-1)<=1 ? 1 : $this->page-1;
//计算下一页页码，最大为page_count
$next_page = ($this->page+1)>=$this->page_count ? $this->page_count : $this->page+1;
//尾页
$end_page= "end";
$nums_page = [];
//这个判断与初始化变量中的判断重复了，但...安全点
if ($this->page_count >= $this->page_li_count) {
//中间li为第几个，偶数取中偏前的一个
$mid_li = $this->page_li_count%2==0 ? $this->page_li_count/2 : (($this->page_li_count-1)/2)+1;
//理想情况下，$mid_li后面li应有的个数
$right_li_num = $this->page_li_count - $mid_li;
//理想情况下，$mid_li前面li应有的个数
$left_li_num = $mid_li-1;
//计算最右边的页码
if ($this->page <= $left_li_num) {
//若当前页左边li个数不足以让其居中，则最右端页码等于最右端li的编号
$right_li_page = $this->page_li_count;
}else {
$right_li_page = ($this->page_count-$this->page) >= $right_li_num ? $this->page+$right_li_num : $this->page_count;
}
for ($i = 0; $i < $this->page_li_count ; $i++) {
//看着可能有点绕，纸上算算就知道了，已知最右边li的页码，li的总数，当前li的编号为$i+1，算当前li对应的页码
$n = $right_li_page-$this->page_li_count+$i+1;
$nums_page[] = $n;
}
}
//将这几个拼接起来
$this->result['first'] = $first_page;
$this->result['end'] = $end_page;
$this->result['pre'] = $pre_page;
$this->result['next'] = $next_page;
$this->result['nums'] = $nums_page;
$this->result['active'] = $this->active;
return $this->result;
}
public function getHTML(){
//待完善........
$url = isset($this->url) ? $this->url : '?';
$first_class = $this->result['active'] == 'first' ? 'active' : '';
$end_class = $this->result['active'] == 'end' ? 'active' : '';
$pre_class = $this->result['active'] == 'pre' ? 'active' : '';
$next_class = $this->result['active'] == 'next' ? 'active' : '';
$first_page_html = <<result['first']}">首页
HTML;
$pre_page_html = <<result['pre']}">上一页
HTML;
$next_page_html = <<result['next']}">下一页
HTML;
$end_page_html = <<result['end']}">尾页
HTML;
$lis_page_html = '';
foreach ($this->result['nums'] as $v){
$li_class = $this->result['active'] == $v ? 'active' : '';
$lis_page_html .= <<$v
HTML;
}
$htmlcode = $first_page_html.$pre_page_html.$lis_page_html.$next_page_html.$end_page_html;
return $htmlcode;
}
}
/***********
*
setPage( isset($_GET['page'])?$_GET['page']:1);
$a->create();
?>
fenye
getHTML()?>
*
*/
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