php分页代码简单实现

As this topic comes over and over again in different forms, I've finally decided to write a short (yea, right...) article / tutorial about pagination with PHP with MySQL database. There are dozens of these kind of tutorials, I know - I wanted to make it as simple as possible and as short as possible AND so we all can reach for it at EE.

随着本主题以不同形式反复出现，我终于决定写一篇简短的（是的，对的...）有关使用MySQL数据库与PHP分页的文章/教程。 我知道有数十种此类教程-我想使其尽可能简单和尽可能短，因此我们都可以在EE上找到它。

First of all - the preparations. I assume you have your Apache + PHP set up (by XAMPP / WAMP / any other).

首先-准备。 我假设您已经设置了Apache + PHP（通过XAMPP / WAMP /任何其他方式）。

1. What you need is one file - lets name it.... hmmm.... index.php ! Place it under a directory of your choice.

1.您只需要一个文件-命名为... hmmm .... index.php！ 将其放在您选择的目录下。

2. Let's setup a database. If you use phpmyadmin, you know what to do - import the script creating the "pagination" table. I have created a database named "test" for it.

2.让我们建立一个数据库。 如果您使用phpmyadmin，则知道该怎么做-导入创建“分页”表的脚本。 我已经为其创建了一个名为“ test”的数据库。

CREATE TABLE IF NOT EXISTS `pagination` (`id` int(11) NOT NULL AUTO_INCREMENT,`name` varchar(100) NOT NULL,PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8 AUTO_INCREMENT=22 ;

Just the 'id' and 'name' (simple, simple, simple,...) fields. This is the data for the table:

只是“ id”和“ name”（简单，简单，简单...）字段。 这是表的数据：

INSERT INTO `pagination` (`id`, `name`) VALUES
(1, 'one'),
(2, 'two'),
(3, 'three'),
(4, 'four'),
(5, 'five'),
(6, 'six'),
(7, 'seven'),
(8, 'eight'),
(9, 'nine'),
(10, 'ten'),
(11, 'eleven'),
(12, 'twelve'),
(13, 'thirteen'),
(14, 'fourteen'),
(15, 'fifteen'),
(16, 'sixteen'),
(17, 'seventeen'),
(18, 'eighteen'),
(19, 'nineteen'),
(20, 'twenty'),
(21, 'twenty one');

Ready to go. Here's the index.php file

准备好出发。 这是index.php文件

<?php// LET'S SEE WHAT'S WRONG// BUT DO NOT DISPLAY NOTICESerror_reporting(E_ALL ^ E_NOTICE);// CONNECT TO THE DB$link = mysql_connect("localhost","you","yourpass") or die(mysql_error());mysql_select_db("test") or die(mysql_error());// WE NEED TO KNOW HOW MUCH RECORDS THERE ARE$query = "select count(*) as recordcount from pagination";$result = mysql_query($query) or die(mysql_error());$row = mysql_fetch_array($result) or die(mysql_error());// NUMBER OF ALL ROWS$numrows = $row['recordcount'];// HERE WE SET THE NUMER OF ITEMS PER ONE PAGE$ipp = 3;// NUMBER OF ALL PAGES// WE USE CEIL SO IF THE RECORD COUNT// IS - FOR EXAMPLE - 11 WE GET 3 PAGES$pagecount = ceil($numrows / $ipp);echo"We have ".$pagecount." pages<br />";// DISPLAY THE PAGES LINKSfor($i=1;$i<=$pagecount;$i++){echo"<a href=\"index.php?page=".$i."\">$i</a> | ";}// THE CURRENT PAGE NUMBER FROM GET VARIABLE// IF NOT SET - IT'S FIRST $page = 0;if(empty($_GET[page]) || !isset($_GET[page])) $page = 1;else $page = $_GET[page];   // WHERE ARE WE ?echo"<br /><br />current page: $page<br /><br />";   // STARTRECORD IS USED FOR THE MYSQL QUERY// SO WE KNOW WHERE WE CAN START FROM// LIMIT WITH IPP (ITEMS PER PAGE)if(!empty($page)) $startrecord = ($page-1)*$ipp;else $startrecord = 0;       $query = "select * from pagination limit $startrecord,$ipp";$result = mysql_query($query) or die(mysql_error());while($row = mysql_fetch_array($result)){echo"<div>$row[id], $row[name]</div>";}// THIS IS THE VALUE FOR THE NUMBER OF// NEXT AND PREVIOUS PAGES DISPLAYED IN// THE DYNAMIC PANEL$margin = 2;// THE DYNAMIC PANELecho"<br /><div>";echo"Page ";if($page == 1);else{$prev = $page - 1;echo" <a href=\"index.php?page=1\">first</a> ";echo" <a href=\"index.php?page=$prev\">prev</a> ";}if($page-$margin <= 0) $start = 1; else $start = $page - $margin;if($page+$margin > $pagecount) $last = $pagecount; else $last = $page + $margin;for($i=$start;$i<=$last;$i++){// SHOW THE CURRENT PAGE WITH DIFFERENT FORMATTINGif($i == $page)echo" <a href=\"index.php?page=$i\" style=\"font-weight: bold;\">$i</a> ";elseecho" <a href=\"index.php?page=$i\">$i</a> ";}if($page == $pagecount);else{$next = $page + 1;echo" <a href=\"index.php?page=$next\">next</a> ";echo" <a href=\"index.php?page=$pagecount\">last</a> ";}echo"</div>";       ?>

This is all you need. The comments are there, but to make myself clear - I will add explanation below. I hope the top part of the script is obvious, we have to connect, display errors and know how much records in the table we have:

这就是您所需要的。 那里有评论，但为了使自己清楚-我将在下面添加解释。 我希望脚本的顶部是显而易见的，我们必须进行连接，显示错误并知道表中有多少记录：

error_reporting(E_ALL ^ E_NOTICE);$link = mysql_connect("localhost","you","yourpass") or die(mysql_error());
mysql_select_db("test") or die(mysql_error());$query = "select count(*) as recordcount from pagination";
$result = mysql_query($query) or die(mysql_error());
$row = mysql_fetch_array($result) or die(mysql_error());$numrows = $row['recordcount'];

Below: $ipp variable is for the Items Per Page, you would change it here to display the number of records you want.

下图：$ ipp变量用于每页项目数，您可以在此处进行更改以显示所需的记录数。

$ipp = 3;

Now we can count the number of the pages: let's say you have 501 records in your query and you set the $ipp to 100. So there are 6 pages with one item on the last - this is why we use ceil.

现在我们可以计算页面数：假设您的查询中有501条记录，并且将$ ipp设置为100。所以有6个页面上的最后一个是项-这就是我们使用ceil的原因。

$pagecount = ceil($numrows / $ipp);
echo"We have ".$pagecount." pages<br />";

Display navigation having all the page links, pointing each link to index.php,

显示具有所有页面链接的导航，将每个链接指向index.php，

having $page variable in $_GET[]. If the page variable is not set, the page number is 1. Then we output the page number - where we are.

$ _GET []中有$ page变量。 如果未设置页面变量，则页面编号为1。然后，我们输出页面编号-我们所在的位置。

for($i=1;$i<=$pagecount;$i++){echo"<a href=\"index.php?page=".$i."\">$i</a> | ";
}if(empty($_GET[page]) || !isset($_GET[page])) $page = 1;
else $page = $_GET[page];  echo"<br /><br />current page: $page<br /><br />";

And the heart of the pagination. We use the "main" db query to output the records FROM certain index with a limit of $ipp (items per page). You put your query instead of "select * from pagination". Display the records.

和分页的心脏。 我们使用“主”数据库查询从某些索引输出记录，记录的上限为$ ipp（每页项）。 您输入查询，而不是“从分页中选择*”。 显示记录。

if(!empty($page)) $startrecord = ($page-1)*$ipp;
else $startrecord = 0;         $query = "select * from pagination limit $startrecord,$ipp";
$result = mysql_query($query) or die(mysql_error());
while($row = mysql_fetch_array($result)){echo"<div>$row[id], $row[name]</div>";
}

That's it. Or isn't it ? Oh, yes - the dynamic panel.

而已。 是不是？ 哦，是的-动态面板。

That is not necessary, but when you have 50 pages - might be handy. It shows the "middle" pages with a $margin variable - for adjacent pages - you can adjust and links to first / previous, next / last page. I've set it to 2.

这不是必需的，但是当您有50页时-可能会很方便。 它显示带有$ margin变量的“中间”页面-对于相邻页面-您可以调整并链接到首页/上一页，下一页/最后一页。 我将其设置为2。

The dynamic panel is divided into sections, this is the "first / previous" section

动态面板分为多个部分，这是“第一个/上一个”部分

if($page == 1);
else
{$prev = $page - 1;echo" <a href=\"index.php?page=1\">first</a> ";echo" <a href=\"index.php?page=$prev\">prev</a> ";
}

We have to know where to start and where to end the pages display, so we count that

我们必须知道页面显示的开始位置和结束位置，所以我们算了一下

if($page-$margin <= 0) $start = 1; else $start = $page - $margin;
if($page+$margin > $pagecount) $last = $pagecount; else $last = $page + $margin;

Below is the section where we display the pages (the numbers).

下面是显示页面（数字）的部分。

for($i=$start;$i<=$last;$i++){// SHOW THE CURRENT PAGE WITH DIFFERENT FORMATTINGif($i == $page)echo" <a href=\"index.php?page=$i\" style=\"font-weight: bold;\">$i</a> ";elseecho" <a href=\"index.php?page=$i\">$i</a> ";
}

And this is the section for the "next / last" links.

这是“下一个/最后一个”链接的部分。

if($page == $pagecount);
else
{$next = $page + 1;echo" <a href=\"index.php?page=$next\">next</a> ";echo" <a href=\"index.php?page=$pagecount\">last</a> ";
}

Let's hope it would work for you. If you want to praise / curse this tutorial, feel free to post a comment.

希望它对您有用。 如果您想赞美/诅咒本教程，请随时发表评论。

翻译自: https://www.experts-exchange.com/articles/4742/Simple-PHP-pagination.html

php分页代码简单实现