PHP automatically adapts to the range of page number paging program_PHP tutorial

效果图：
 
记得以前看到过一个页码方式的分页效果，页码数多了折行继续显示一直到60多页，呵呵！有点影响美观！

于是写了一个，可以自动适应范围的页码分页程序
也就是说，页码格式如下
<< < 1 2 3 4 5 6 7 > >>
<< < 6 7 8 9 10 11 12 > >>

下划线为当前页，这样就可以固定显示一个相近的页码，避免太长影响美观
代码加了注释，主要是新手看看，呵呵 ，写这个函数，没有考虑表现结构分离问题，高手就不要追究了！

function page($page,$total,$phpfile,$pagesize=10,$pagelen=7){
$pagecode = '';//定义变量，存放分页生成的HTML
$page = intval($page);//避免非数字页码
$total = intval($total);//保证总记录数值类型正确
if(!$total) return array();//总记录数为零返回空数组
$pages = ceil($total/$pagesize);//计算总分页
//处理页码合法性
if($page<1) $page = 1;
if($page>$pages) $page = $pages;
//计算查询偏移量
$offset = $pagesize*($page-1);
//页码范围计算
$init = 1;//起始页码数
$max = $pages;//结束页码数
$pagelen = ($pagelen%2)?$pagelen:$pagelen+1;//页码个数
$pageoffset = ($pagelen-1)/2;//页码个数左右偏移量

//生成html
$pagecode='

';
$pagecode.="$page/$pages";//第几页,共几页
//如果是第一页，则不显示第一页和上一页的连接
if($page!=1){
$pagecode.="<<";//第一页
$pagecode.="<";//上一页
}
//分页数大于页码个数时可以偏移
if($pages>$pagelen){
//如果当前页小于等于左偏移
if($page<=$pageoffset){
$init=1;
$max = $pagelen;
}else{//如果当前页大于左偏移
//如果当前页码右偏移超出最大分页数
if($page+$pageoffset>=$pages+1){
$init = $pages-$pagelen+1;
}else{
//左右偏移都存在时的计算
$init = $page-$pageoffset;
$max = $page+$pageoffset;
}
}
}
//生成html
for($i=$init;$i<=$max;$i++){
if($i==$page){
$pagecode.=''.$i.'';
} else {
$pagecode.="$i";
}
}
if($page!=$pages){
$pagecode.=">";//下一页
$pagecode.=">>";//最后一页
}
$pagecode.='

';
return array('pagecode'=>$pagecode,'sqllimit'=>' limit '.$offset.','.$pagesize);
}
?>

Function parameters:

$page The current page number obtained by $_GET
$total The total number of records
$phpfile Page number connection file name
$pagesize No need to explain it haha
$pagelen displays the maximum number of page numbers. Note (odd number), it is symmetrical!
The function returns an array:
The content corresponding to the pagecode index is the generated HTML code
The corresponding content to the sqllimit index is the sql limit suffix

Usage:

$phpfile = 'index.php';
$page= isset($_GET['page'])?$_GET['page']:1;
$db = new Mysql();
$counts = $db->counts('select `id` from `test`');
$sql='select `id`,`title` from `test`';
$getpageinfo = page($page,$counts,$phpfile);
$sql.=$getpageinfo['sqllimit'];
$data = $db->getRows($sql);
?>
echo $getpageinfo['pagecode'];//显示分页的html代码
?>

$phpfile = 'index.php';
$page= isset($_GET['page' ])?$_GET['page']:1;
$db = new Mysql();
$counts = $db->counts('select `id` from `test`'); $sql='select `id`,`title` from `test`'; $getpageinfo = page($page,$counts,$phpfile);

$sql.=$getpageinfo['sqllimit '];

$data = $db->getRows($sql);
• ?>
echo $getpageinfo['pagecode'];//Display paging html code ?>
css

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