PHP pagination code_PHP tutorial

[php]

/*

Thoughts

1. Get the URL from the address bar

2. Analyze the query part of the URL - that is, the part where parameters are passed later

3. The query part is analyzed into an array

4. Change the page unit in the array, +1, -1, to form 2 new arrays

5. Splice the new array into the query part to synthesize the previous page and next page connection address

*/

//Paging class

class Page {

public $total; //Total number of items, retrieved from the database

public $prePage = 10; //Number of items per page

protected $curr= 1; //default current page number

public function __construct($total,$prePage='') {

$this->total = $total; //Put the total entry information in the total attribute

if ($prePage > 0) {

$this->prePage = $prePage; //Put the number of each page in the perPage attribute

} }

//Calculate the current page number

if (isset($_GET['page']) && ($_GET['page'] + 0) > 0) {

$this->curr = $_GET['page'] + 0;

} }

}

//Main function

public function showPage() {

if ($this->total

                                                                                                                                                                         

} }

$cnt = ceil($this->total / $this->prePage); //Calculate the total number of pages and round to the nearest whole number

//According to the current page, count the previous page and next page

/*

How many situations are there when analyzing url?

xx.php

xx.php?id=5

xx.php?page=3

xx.php?id=5&page=3

*/

//The final generated URL must contain page=N

$url = $_SERVER['REQUEST_URI'];

$parse = parse_url($url); //Put the URL analysis results in the array

//print_r($parse);

//Make sure there is page in the parameter

if (!isset($parse['query'])) {

$parse['query'] = 'page=' .$this->curr;

} }

//Analyze the query string into an array and make sure there is page option again

parse_str($parse['query'],$parms);

if (!array_key_exists('page', $parms)) {

$parms['page'] = $this->curr;

} }

//Test all four situations above and the page parameters can be generated

//print_r($parms);

//Determine whether there are any other parameters besides page

if (count($parms) == 1) {

$url = $parse['path'] . '?';

} else {

unset($parms['page']);

$url = $parse['path'] . '?' . http_build_query($parms) . '&';

} }

//echo $url

$prev = $this->curr - 1;

$next = $this->curr + 1;

//Homepage

$indexLink = 'Homepage';

//Previous page

if ($prev

$prevLink = '';

}else {

$prevLink = 'Previous page';

} }

//Next page

if ($next > $cnt) {

$nextLink = '';

}else {

                  $nextLink = 'Next Page';

} }

//Last page

$lastLink = 'Last page';

//echo $indexLink.' '.$prevLink.' '.$nextLink .' '.$lastLink;

//Previous page, 1 2 3 4 5 next page

$start = $this->curr - (5-1)/2; //Calculate the page number starting from the left

$end = $this->curr + (5-1)/2; //Calculate the page number starting on the right

//If the page on the left is already less than 1, add the part less than 1 to the right

if ($start

$end += (1 - $start);

$start = 1; //Modify start = 1

if ($end > $cnt) {

$end = $cnt;

      }  

} }

//Add the excess on the right side to the left side

if ($end > $cnt) {

$start -= ($end - $cnt);

$end = $cnt;

if ($start

$start = 1;

      }  

} }

//Loop out the page number

$pageStr = '';

for ($i=$start; $i

                                                       

if ($i == $this->curr) {

$pageStr .= $i;

continue;

      }  

$pageStr .= '' . $i . '';

} }

return $indexLink.$prevLink.$pageStr.$nextLink.$lastLink;

}

}

$page = new Page(30,3);

echo $page->showPage();

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