class Paging {
private static $_Instance;
private function __clone(){}
public static function getInstance() {
if(empty(self::$_Instance)) self::$_Instance = new self();
return self::$_Instance;
}
protected $count = 0;
protected $size = 0;
protected $page = 0;
function prepare($sql, $pagesize=10) {
$page = isset($_GET['page']) ? $_GET['page'] : 1;
$pageon = ($page - 1) * $pagesize;
$sql = preg_replace('/select\s/i', '$0SQL_CALC_FOUND_ROWS ', $sql) . " limit $pageon, $pagesize";
$rs = mysql_query($sql);
$p = mysql_query('SELECT FOUND_ROWS()');
list($this->count) = mysql_fetch_row($p);
$this->size = $pagesize;
$this->page = $page;
return $rs;
}
function bar($tpl='') {
if(!$tpl) $tpl = '共{count}页 第{page}页 <a href=?{reset}>首页</a> <a href=?{prve}>上一页</a> <a href=?{next}>下一页</a> <a href=?{end}>尾页</a>';
$count = ceil($this->count / $this->size);
$page = $this->page;
$d = array(
'{reset}' => 1,
'{prve}' => $page > 1 ? $page - 1 : 1,
'{next}' => $page < $count ? $page + 1 : $page,
'{end}' => $count,
'{count}' => $count,
'{page}' => $page,
);
foreach($d as $k=>&$v) {
if(in_array($k, array('{reset}', '{prve}', '{next}', '{end}'))) {
$_GET['page'] = $v;
$v = http_build_query($_GET);
}
}
echo strtr($tpl, $d);
}
}
function mysql_paging_query($sql, $num=10) {
return Paging::getInstance()->prepare($sql, $num);
}
function mysql_paging_bar($tpl='') {
return Paging::getInstance()->bar($tpl);
}
include 'paging.php';
$rs = mysql_paging_query($sql, 20);//替代 mysql_query
mysql_paging_bar();//显示分页条
