PHP Pagination

pagination_helper.php

<?php
	/*
		$params['total_rows'] = 100;
		$params['page'] = isset($_GET['page']) ? $_GET['page'] : 1;
		$params['type'] = get_uri_params();
		$params['per_page'] = 10;
		echo pagination( $params );
	*/

	function pagination( $params )
	{
		$per_page = 20;
		$type = get_uri_params();
		$page = 1;
		$jump = 1;
		$i = 1;
		
		if (count($params) > 0)
		{
			foreach ($params as $key => $val)
			{
				$$key = $val;
			}
		} else {
			return '';
		}
		
		$total_page = ( $total_rows % $per_page ) ? floor( $total_rows / $per_page ) + 1 : floor( $total_rows / $per_page );
		if ( $page > $total_page ) { $page = $total_page;  }

		//$prev_page = $page - 1 > 0 ? $page - 1 : 1 ;
		//$next_page = $page + 1 >= $total_page ? $total_page : $page + 1;
		$next_page = $page + 1;
		$prev_page = $page - 1;

		$type = !empty($type) ? $type.'&' : '';

		$output = "共<strong>$total_rows</strong>条数据，当前第<strong>$page/$total_page</strong>页，每页<strong>$per_page</strong>条数据";
		$output .= $page <= 1 ? "<span>首页</span>" : "<a href='?" . $type . "page=1'>首页</a>";
		$output .= $prev_page < 1 ? "<span>上一页</span>" : "<a href='?" . $type . "page=$prev_page'>上一页</a>";
		$output .= $next_page > $total_page ? "<span>下一页</span>" : "<a href='?" . $type . "page=$next_page'>下一页</a>";
		$output .= $page >= $total_page ? "<span>末页</span>" : "<a href='?" . $type . "page=$total_page'>末页</a>";		

		if ( $jump ) {
			$output .= '<span id="jump">转到第<select name="page" id="quick_channel" onchange="gourl()">';
			do{
				$output .= '<option value="'.$i.'">'.$i.'</option>';
				$i++;
			}while( $i < $total_page+1 );

			$output .= '</select>页</span>';
			$output .= '<script type="text/javascript">function gourl(){var x = document.getElementById("quick_channel").value; window.location.href = "http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].'?'.$type.'page="+x; } document.getElementById("quick_channel").value = '.$page.';</script>';
		}

		return $output;
	}

	/**
	 * 分解页面URI，得到分页参数
	 *
	 * @return String
	 * @author Vince
	 **/
	function get_uri_params( $default = 'page', $uri = array() )
	{
		$uri = empty($uri) ? $_GET : $uri;
		if (is_array($default)) {
			foreach ($default as $value) {
				unset( $uri[$value] );
			}
		} else {
			unset( $uri[$default] );
		}
		
		return http_build_query( $uri );
	}
?>