PHP long article paging principle and implementation procedure

PHP long article paging principle and implementation procedure_PHP tutorial

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Release： 2016-07-13 16:56:37

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Below I will analyze the long article paging and article paging program codes. Friends in need can refer to it.

Method 1: Paging according to word count control

Paging by word count is simple and easy to use, but the effect is not good.

General idea: First, set the maximum number of words that can be accommodated on each page; then, calculate the total number of words in the article content, and then calculate the total number of pages based on the total number of words and the maximum number of words on a single page. In this way, the entire preparation for paging has been completed.

The specific display content of each page can be achieved through content interception. For example: if the page contains 500 words and the article contains 2200 words, then when page=2 is passed to the page, the content between 501st and 1000th should be displayed.

This method is simple, but you may encounter trouble when displaying. Article content is usually accompanied by HTML tags. It is difficult to close the HTML tags when cutting content. If this work is not done well, the effect after paging will be It's obviously not good either.

Method 2: Paginate using page breaks

Paging through page breaks is more ideal than the first method.

General idea: When editing the article content, insert page breaks (such as:

) into the content, and divide the article content when the article is displayed. Each part represents the content of a page, and the display is controlled by passing parameters. A few pages.

This method is more user-friendly. After all, the content intercepted by manually controlled paging is more in line with our thinking, and it can avoid the situation of unclosed HTML tags to a certain extent.

The article content pagination code operates based on the page breaks inserted by the editor. We can create pagination with super beautiful offset effects.

The code is as follows

Copy code

$content1="The content needs to be very long...";

$current=$_REQUEST['page_t'];
$result=ff_page($content1,$current);
echo $result;

";
echo "".$page."/".$PageCount."page ";
If($page>1)
echo "Previous page ";
else else
echo "Previous page";

for( $i=1 ; $i <= $PageCount ; $i++)
{ echo "[".$i."] ";
}

if($page < $PageCount)
echo " Next page ";
else
echo "next page";
echo "";
}
}
}

The code is as follows

Copy code

class contentpage
{
private $content; //Article content
private $pagesize; //Minimum number of bytes per page
private $breakflag; //Page break (can be customized, default is n)
private $pageurl; //url address
private $pagevar; //Paging parameters
public $pagecount; //Total number of pages
public $page; //Current page number
public $pagebreak; //Start position of each page

function __construct($content = "",$pagesize = 10,$breakflag ="n",$pageurl = '',$pagevar = 'p')
{
$this->content = $content;
$this->pagesize = $pagesize;
$this->breakflag = $breakflag;
$this->pageurl = $pageurl;
$this->pagevar = $pagevar;
$this->getpages();
}

//Total number of pages, starting position and ending position of each page
public function getpages()
{
$contentlen = strlen($this->content); //The total number of bytes of the article
$this->pagebreak[0] = 0;
$i = 0;
$offset = $this->pagesize;

for ($k=0;$k<$contentlen/$this->pagesize;$k++)
{
if($offset > $contentlen)
{
$i++;
$this->pagebreak[$i] = $contentlen;
Break;
}
//Find the location where $this->pagevar appears
$where = strpos($this->content,$this->breakflag,$offset);
if($where > $contentlen or intval($where) < 1)
{
$i++;
$this->pagebreak[$i] = $contentlen;
Break;
}
else
{
$i++;
$this->pagebreak[$i] = $where;
$offset = $where + $this->pagesize;
}
}
$this->pagecount = $i;
if(isset($_get[$this->pagevar]) && $_get[$this->pagevar] >1 && $_get[$this->pagevar] <= $this->pagecount)
{
$this->page = $_get[$this->pagevar];
}
else
{
$this->page = 1;
}
}

//Content of each page
function getpage()
{
//Intercept the data of the current page number
if($this->page > 1)
{
return substr($this->content,$this->pagebreak[$this->page-1]+1,$this->pagebreak[$this->page] - $this->pagebreak [$this->page-1]);
}
else
{
return substr($this->content,$this->pagebreak[$this->page-1],$this->pagebreak[$this->page] - $this->pagebreak[$ this->page-1]);
}

}

//Pagination bar
public function getpagenav()
{
if($this->page > 1)
{
$pagenav = "Previous page< /a> ";
}

//输出数字页码
for($j=1;$j<=$this->pagecount;$j++)
{
   if($j == $this->page)
   {
    $pagenav .= "".$j."  ";
   }
   else
   {
    $pagenav .= "".$j."  ";
   }
}
//下一页
if($this->page < $this->pagecount && $this->pagecount >1)
{
   $pagenav .= "下一页  ";
}
return $pagenav;
}
//获取url地址
public function geturl()
{
$url = $_server['request_uri'];
$parse_url = parse_url($url);
$query_url = $parse_url['query'];

if($query_url)
{
   $query_url = ereg_replace("(^|&)".$this->pagevar."=".$this->page,"",$query_url);
   $url = str_replace($parse_url['query'],$query_url,$url);
   if($query_url)
   {
    $url .= "&".$this->pagevar;
   }
   else
   {
    $url .= $this->pagevar;
   }
}
else
{
   $url .= "?".$this->pagevar;
}
return $url;
}
}

$content = "第一页：文章内容分页阿斯顿浪费空间阿斯顿来看福建省地方吉林省福建路口附近大手拉飞机上浪费的说浪费监理费
第二页：阿斯顿房间阿双方了解啊对萨拉开发记得谁来付款将令对方空间的来福建阿里是否
第三页：欧文炯诶哦生地拉开方面来看就继续超文章内容分页滤机蓝卡
第四页：欧文日据拉萨及发动四分啊就双方的将爱是发觉是文章内容分页否了。";
$model = new contentpage($content);
echo $model->getpage(); //输出分页内容
echo $model->getpagenav(); //输出页码
?>

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