Specific methods of using PHP pagination class_PHP tutorial

In this article we introduce to you in detail the code examples of

PHP paging class:

1. < ?php
2. / /In order to avoid errors caused by repeated inclusion of files,
   adds a condition to determine whether the function exists:
3. if(!function_exists(pageft)){
4. //Define the function pageft(), the meanings of the three parameters are:
5. //$totle: the total number of information;
6. //$displaypg: The number of information displayed on each page, the default setting here is 20;
7. //$url: Links in paging navigation, in addition to adding different
   The parts other than "page" of the query information are the same as this URL.
8. //The default value should be set to the URL of this page (i.e. $_SERVER
   ["REQUEST_URI"]), but the
   to the right of the default value can only be a constant , so the default value is set to an empty string, and then set to the URL of this page inside the function.
9. function pageft($totle,$displaypg=20,$url='' ){
10. //Define several global variables:
11. //$page: current page number;
12. //$firstcount: the starting item of (database) query;
13. //$pagenav: page navigation bar code, it is not output inside the function;
14. //$_SERVER: necessary to read the URL "$_SERVER["REQUEST_URI"]" of this page.
15. global $page,$firstcount,$pagenav,$_SERVER;
16. //To make the "$displaypg" here accessible from outside the function ”
    and set it as a global variable as well. Note that after a variable is redefined
    as a global variable, the original value is overwritten, so it is reassigned here.
17. $GLOBALS["displaypg"]=$displaypg;
18. if(!$page) $page=1;
19. //If $url is used By default, which is an empty value, the value is assigned to the URL of this page:
20. if(!$url){ $url=$_SERVER["REQUEST_URI"];}
21. //URL analysis:
22. $parse_urlparse_url=parse_url($url);
23. $ url_query=$parse_url["query"]; //Get the query string of the URL separately
24. if($url_query){
25. //Because the URL may contain page number information,
    We're going to remove it so we can add the new page number information.
26. //Regular expressions are used here
27. $url_query=ereg_replace("(^|&)page=$ page","",$url_query);
28. //Replace the query string of the processed URL with the query string of the original URL:
29. $url=str_replace($parse_url["query "],$url_query,$url);
30. //Add page query information after the URL, but wait for assignment:
31. if( $url_query) $url.="&page"; else $url.="page";
32. }else {
33. $url.= "?page";
34. }
35. //Page number calculation:
36. $lastpg=ceil($totle/ $displaypg); //The last page is also the total number of pages
37. $page=min($lastpg,$page);
38. $prepg=$page-1; //Previous page
39. $nextpg=( $page==$lastpg ? 0 : $page+1); //Next page
40. $firstcount=($page-1)*$displaypg;
41. //Start paging navigation bar code :
42. $pagenav="Showing page ".($totle?($firstcount+1):0)."
    B>-<B> ;".min($firstcount+$displaypg,$totle)."
    B> records, total $totle records< BR>";
43. //If there is only one page, jump out of the function:
44. if($lastpg<=1) return false;
45. $pagenav.=" < a href='$url=1'> Home page< /a> "; 🎜>=
46. " < a href='$url=$prepg'>Previous page< /a> "; else $pagenav.=" Previous page ";
47. if($nextpg) $pagenav .="
    < a href='$url=$nextpg'>Next page< /a> "; else $pagenav.=" Next page "
;
48. //Drop-down jump list, loop list All page numbers: $pagenav.=
49. " to page < ; select name='topage' size='1' onchange='window.location="
50. $url="+this.value'>
    n"; for($i=1
;$i
51. <=$lastpg;$i++){ if($ i==$page) $pagenav.
=
52. " < option value='$i' selected>$i< /option>n"; 🎜>pagenav.=" $i< /option>n"
    ; 🎜>="< /select> pages of $lastpg pages"
53. ; } }
    ?>
55. The above is the detailed usage of PHP paging class. I hope it will be helpful to everyone. http://www.bkjia.com/PHPjc/446164.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/446164.html
56. TechArticleIn this article, we introduce code examples of PHP pagination classes in detail: ?php //For To avoid errors caused by repeated inclusion of files, a condition is added to determine whether the function exists:...