PHP Page-Class programmer

Class Page {
Public param
Public $pageName = ' page '; Default page label, which is the pagename in filename.php?pagename=4
Public $prevPage = ' < '; Previous page
Public $nextPage = ' > '; Next page
Public $prevBar = ' << '; Previous Page Bar
Public $nextBar = ' >> '; Next Page Bar
Private param
Private $_totalnums = 1; Total number of records
Private $_barnum = 10; Pagination Display number of pages
Private $_totalpage = 0; Total pages
Private $_nowpage = 1; Current page
Private $_perpage = 10; Show number of records per page
Private $_preurl = '; URL Prefix
Private $_prenow = 0; The number of pages to display before the current page (the range should be 0 to $_barnum-1)
Private $_frompage = 0; Starting point of page-bar
Private $_topage = 0; Page Bar End
Private $_offset = 0; SQL query Record offset
Public functions-----------------------------------------------------------------
Constructor initializes a paging variable
Total records of @param $nums int
@param $per int Displays the number of records per page
@param $now int Current page
@param $url string URL prefix is null by default
Public function __construct ($nums, $per = ', $preNow = ', $barNum = ', $now = ', $url = ') {
Class
$this->_set ($nums, $per, $preNow, $barNum, $now, $url);
$this->_totalpage = ceil ($this->_totalnums/$this->_perpage);
$this->_offset = ($this->_nowpage-1) * $this->_perpage;
}
Previous page
Public Function Getprevpage () {
The current page is not the first page
if ($this->_nowpage > 1) {
return $this->_setlink ($this->_seturl ($this->_nowpage-1), $this->prevpage, ' prevpage ');
}
}
Next page
Public Function Getnextpage () {
Current page is less than total pages
if ($this->_nowpage < $this->_totalpage) {
return $this->_setlink ($this->_seturl ($this->_nowpage + 1), $this->nextpage, ' nextPage ');
}
}
First page
Public Function Getfirstpage () {
Starting point is not the first page
if ($this->_nowpage-$this->_prenow) > 1) {
return $this->_setlink ($this->_seturl (1), ' 1 ... ', ' firstpage ');
}
}
Last page
Public Function Getlastpage () {
End not greater than total number of pages
if (($this->_nowpage-$this->_prenow + $this->_barnum) <= $this->_totalpage) {
return $this->_setlink ($this->_seturl ($this->_totalpage), ' ... '. $this->_totalpage, ' lastpage ');
}
}
Previous Page Bar
Public Function Getprevbar () {
The starting point is greater than the number of page-bars
if ($this->_nowpage-$this->_prenow) > $this->_barnum) {
return $this->_setlink ($this->_seturl ($this->_nowpage-$this->_prenow)-$this->_barnum), $this- >prevbar, ' Prevbar ');
}
}
Next Page Bar
Public Function Getnextbar () {
End not greater than total number of pages
if (($this->_nowpage-$this->_prenow + $this->_barnum) <= $this->_totalpage) {
return $this->_setlink ($this->_seturl ($this->_frompage + $this->_barnum), $this->nextbar, ' Nextbar ') ;
}
}
Page-Bar
Public Function Pagebar () {
Initialize the beginning end point of the page bar
$this->_topage = $this->_nowpage + ($this->_barnum-$this->_prenow-1);
if ($this->_topage > $this->_totalpage) {
$this->_prenow = $this->_barnum-($this->_totalpage-$this->_nowpage + 1);
$this->_topage = $this->_totalpage;
}
if ($this->_topage < $this->_barnum) {
$this->_topage = $this->_barnum;
}
$this->_frompage = $this->_nowpage-$this->_prenow;
if ($this->_frompage < 1) {
$this->_frompage = 1;
}
Initializing a page-bar
$return = ';
for ($i = $this->_frompage; $i <= $this->_topage; $i + +) {
if ($i!= $this->_nowpage) {
$return. = $this->_setlink ($this->_seturl ($i), $i, ' page ');
} else {
$return. = ' <span class= ' nowpage ' > '. $i. ' </span> ';
}
}
return $return;
}
return offset for SQL query
Public Function GetOffset () {
return $this->_offset;
}
Returns the total number of records
Public Function gettotalnums () {
Return ' <span class= ' totalnums ' > '. $this->_totalnums. ' </span> ';
}
Show page pagination
Public Function ShowPage () {
return $this->gettotalnums (). $this->getfirstpage (). $this->getprevbar (). $this->getprevpage (). $this->pagebar (). $this->getnextpage (). $this->getnextbar (). $this->getlastpage ();
}
Private Functions----------------------------------------------------------------
//
Private Function _set ($nums, $per, $preNow, $barNum, $now, $url) {
Set the total number of records
if ($nums > 0) {
$this->_totalnums = $nums;
}
Set the number of records to display per page
if ($per > 0) {
$this->_perpage = $per;
}
Set the number of pages to display before the current page
if ($preNow > 0) {
$this->_prenow = $preNow;
}
Set the number of page-bar links
if ($barNum > 0) {
$this->_barnum = $barNum;
}
Set Current page
if (empty ($now)) {
Automatically get
if (Isset ($_get[$this->pagename])) {
$this->_nowpage = intval ($_get[$this->pagename]);
}
} else {
$now has been manually processed
$this->_nowpage = intval ($now); //
}
Set URL prefix
if (!empty ($url)) {
$url has been manually processed
$this->_preurl = $url. (Stristr ($url, '? ') ' & ': '? ' . $this->pagename. '=';
} else {
Automatically get
if (Empty ($_server[' query_string ')) {
Query not present in URL
$this->_preurl = $_server[' Request_uri ']. '?' . $this->pagename. '=';
} else {
if (Stristr ($_server[' query_string '), $this->pagename. '=')) {
There are page=n (2,3 ...) in the query.
$this->_preurl = Str_replace ($this->pagename. '=' . $this->_nowpage, ', $_server[' Request_uri ']);
$lastCharacter = $this->_preurl[strlen ($this->_preurl)-1];
if ($lastCharacter = = '? ' | | $lastCharacter = = ' & ') {
Page=n (2,3 ...) at the end of the original URL
$this->_preurl. = $this->pagename. '=';
} else {
Page=n (2,3 ...) is not at the end of the original URL
$this->_preurl. = ' & '. $this->pagename. '=';
}
} else {
There is no page=n (2,3 ...) in the query.
$this->preurl = $_server[' Request_uri ']. ' & '. $this->pagename. '=';
}
}
}
}
Set up a link address
Private Function _seturl ($pageNo) {
Return $this->_preurl. $pageNo;
}
Set up a link
Private Function _setlink ($url, $link, $style = ') {
$style = ' class= '. $style. '"';
Return ' <a href= '. $url. '" ' . $style. ' > '. $link. ' </a> ';
}
}
//

How to use

$total = 1245;
//class  page ($nums, $per = ', $preNow = ', $barNum = ', $now = ', $url = ')
$page = new page ($total); br> $pager = $page->showpage ();
$smarty->assign (' pager ', $pager);
$smarty->display (' Index.tpl ');