李炎辉视频2.7 分页函数

1）先将 html 包成函数，放到核心函数库

/**
	 * _paging 分页函数
	 * @param int $_type   1/2
	 * 1---数字分页
	 * 2---文本分页
	 */ 
	function _paging($_type){
		
		//在这里拿不到值，做成全局变量就能拿到值了
		global $_page,$_pageabsolute,$_num,$_id;
		
		if($_type == 1){
			//以数字分组
			echo '<div id="page_num">';
			echo 	'<ul>';
				    for($i=0;$i<$_pageabsolute;$i++){
						if($_page == $i+1){
							echo '<li><a href="'.SCRIPT.'.php?'.$_id.'page='.($i+1).'" class="selection">'.($i+1).'</a></li>';
						}else{
							echo '<li><a href="'.SCRIPT.'.php?'.$_id.'page='.($i+1).'">'.($i+1).'</a></li>';
						}
					}
			echo	'</ul>';
			echo '</div>';
	
		}elseif($_type == 2){
			//以文本分组
			echo '<div id="page_text">';
			echo	'<ul>';
			echo		'<li>'.$_page.'/'.$_pageabsolute.'页 | </li>';
			echo		'<li>共有<strong>'.$_num.'</strong>条数据 | </li>';
				if($_page == 1){
					echo '<li>首页 | </li>';
					echo '<li>上一页 | </li>';
				}else{
					echo '<li><a href="'.SCRIPT.'.php">首页</a> | </li>';
					echo '<li><a href="'.SCRIPT.'.php?'.$_id.'page='.($_page -1).'">上一页</a> | </li>';
				}
				if($_page == $_pageabsolute){
					echo "<li>下一页 | </li>";
					echo "<li>尾页 | </li>";
				}else{
					
					echo '<li><a href="'.SCRIPT.'.php?'.$_id.'page='.($_page +1).'">下一页</a> | </li>';
					echo '<li><a href="'.SCRIPT.'.php?'.$_id.'page='.$_pageabsolute.'">尾页</a>  </li>';
				}	
			echo    '</ul>';
			echo '</div>';	
			
		}else{
				//以数字分组
			echo '<div id="page_num">';
			echo 	'<ul>';
				    for($i=0;$i<$_pageabsolute;$i++){
						if($_page == $i+1){
							echo '<li><a href="'.SCRIPT.'.php?page='.($i+1).'" class="selection">'.($i+1).'</a></li>';
						}else{
							echo '<li><a href="'.SCRIPT.'.php?page='.($i+1).'">'.($i+1).'</a></li>';
						}
					}
			echo	'</ul>';
			echo '</div>';
		}
	} 

    2）调用此函数

       

3）分页模块

function _page($_sql,$_size){
		global $_pagesize,$_pagenum,$_page,$_pageabsolute,$_num;
		//分页模块
	if(isset($_GET['page'])){
		$_page = $_GET['page'];
		if(empty($_page) || $_page<=0 || !is_numeric($_page)){
			$_page = 1;
		}else{
			$_page = intval($_page);
		}	
	}else{
		$_page = 1;
	}
	
	//一页12个
	$_pagesize = $_size;
	//首先要得到所有数据的总和--_num_rows--mysql.func.php中封装的函数
	$_num =  _num_rows(_query($_sql));
	if($_num == 0){
		$_pageabsolute = 1;
	}else{
		$_pageabsolute = ceil($_num / $_pagesize);
	}
	if($_page > $_pageabsolute){
		$_page = $_pageabsolute;	
	}
	$_pagenum = ($_page - 1) * $_pagesize;
	
	//进一取整法 ceil
	} 

4）调用