Code of a PHP paging class

The following code is used:
PHP
Copy codeThe Code is as follows:
<?
/**
* Filename: ext_page.class.php
* @ Package: phpbean
* @ Author: feifengxlq <feifengxlq # gmail.com> * @ Copyright: Copyright 2006 feifengxlq
* @ License: version 2.0
* @ Create: 2006-5-31
* @ Modify: 2006-6-1
* @ Modify: feifengxlq 2006-11-4
* Description: Paging type. Four paging modes are available.
* 2.0 added: supports custom styles and styles, and supports both PHP4 and PHP5,
* To see detail, please visit http://www.phpobject.net/blog/read.php?
* Example:
* Mode: Four paging modes:
Require_once ('../libs/classes/page. class. php ');
$ Page = new page (array ('Total' => 1000, 'perpage' => 20 ));
Echo 'mode: 1 <br> '. $ page-> show ();
Echo 'Echo 'Echo 'Enable AJAX:
$ Ajaxpage = new page (array ('Total' => 1000, 'perpage' => 20, 'ajax '=> 'ajax _ page ', 'page _ name' => 'test '));
Echo 'mode: 1 <br> '. $ ajaxpage-> show ();
Use the inherited custom paging display mode:
Demo: http://www.phpobject.net/blog
*/
Class page
{
/**
* Config, public
*/
Var $ page_name = "PB_page"; // page tag, used to control url pages
Var $ next_page = '>'; // next page
Var $ pre_page = '<'; // Previous Page
Var $ first_page = 'first'; // Home Page
Var $ last_page = 'lala'; // the Last page.
Var $ pre_bar = '<'; // The last page
Var $ next_bar = '>'; // next page
Var $ format_left = '[';
Var $ format_right = ']';
Var $ is_ajax = false; // whether the AJAX paging mode is supported

/**
* Private
*
*/
Var $ pagebarnum = 10; // control the number of records.
Var $ totalpage = 0; // total number of pages
Var $ ajax_action_name = ''; // AJAX action name
Var $ nowindex = 1; // current page
Var $ url = ""; // url Header
Var $ offset = 0;

/**
* Constructor
*
* @ Param array $ array ['Total'], $ array ['perpage'], $ array ['nowindex '], $ array ['url'], $ array ['ajax ']
*/
Function page ($ array)
{
If (is_array ($ array )){
If (! Array_key_exists ('Total', $ array) $ this-> error (_ FUNCTION __, 'Need a param of total ');
$ Total = intval ($ array ['Total']);
$ Perpage = (array_key_exists ('perpage', $ array ))? Intval ($ array ['perpage']): 10;
$ Nowindex = (array_key_exists ('nowindex ', $ array ))? Intval ($ array ['nowindex ']): '';
$ Url = (array_key_exists ('url', $ array ))? $ Array ['url']: '';
} Else {
$ Total = $ array;
$ Perpage = 10;
$ Nowindex = '';
$ Url = '';
}
If ((! Is_int ($ total) | ($ total <0) $ this-> error (_ FUNCTION __, $ total. 'is not a positive integer! ');
If ((! Is_int ($ perpage) | ($ perpage <= 0) $ this-> error (_ FUNCTION __, $ perpage. 'is not a positive integer! ');
If (! Empty ($ array ['page _ name']) $ this-> set ('page _ name', $ array ['page _ name']); // set pagename
$ This-> _ set_nowindex ($ nowindex); // you can specify the current page.
$ This-> _ set_url ($ url); // sets the link address.
$ This-> totalpage = ceil ($ total/$ perpage );
$ This-> offset = ($ this-> nowindex-1) * $ perpage;
If (! Empty ($ array ['ajax ']) $ this-> open_ajax ($ array ['ajax']); // enable the ajax Mode
}
/**
* Set the value of the variable name specified in the class. If the change volume does not belong to this class, throw an exception
*
* @ Param string $ var
* @ Param string $ value
*/
Function set ($ var, $ value)
{
If (in_array ($ var, get_object_vars ($ this )))
$ This-> $ var = $ value;
Else {
$ This-> error (_ FUNCTION __, $ var. "does not belong to PB_Page! ");
}

}
/**
* Open the inverted AJAX mode.
*
* @ Param string $ action the default ajax-triggered action.
*/
Function open_ajax ($ action)
{
$ This-> is_ajax = true;
$ This-> ajax_action_name = $ action;
}
/**
* Get the code that displays the next page.
*
* @ Param string $ style
* @ Return string
*/
Function next_page ($ style = '')
{
If ($ this-> nowindex <$ this-> totalpage ){
Return $ this-> _ get_link ($ this-> _ get_url ($ this-> nowindex + 1), $ this-> next_page, $ style );
}
Return '<span class = ". $ style.">'. $ this-> next_page. '</span> ';
}

/**
* Get the code for displaying the "Previous Page"
*
* @ Param string $ style
* @ Return string
*/
Function pre_page ($ style = '')
{
If ($ this-> nowindex> 1 ){
Return $ this-> _ get_link ($ this-> _ get_url ($ this-> nowindex-1), $ this-> pre_page, $ style );
}
Return '<span class = ". $ style.">'. $ this-> pre_page. '</span> ';
}

/**
* Get the code for displaying the "Homepage"
*
* @ Return string
*/
Function first_page ($ style = '')
{
If ($ this-> nowindex = 1 ){
Return '<span class = ". $ style.">'. $ this-> first_page. '</span> ';
}
Return $ this-> _ get_link ($ this-> _ get_url (1), $ this-> first_page, $ style );
}

/**
* Get the code for displaying the "Last page"
*
* @ Return string
*/
Function last_page ($ style = '')
{
If ($ this-> nowindex ==$ this-> totalpage ){
Return '<span class = ". $ style.">'. $ this-> last_page. '</span> ';
}
Return $ this-> _ get_link ($ this-> _ get_url ($ this-> totalpage), $ this-> last_page, $ style );
}

Function nowbar ($ style = '', $ nowindex_style = '')
{
$ Plus = ceil ($ this-> pagebarnum/2 );
If ($ this-> pagebarnum-$ plus + $ this-> nowindex> $ this-> totalpage) $ plus = ($ this-> pagebarnum-$ this-> totalpage + $ this-> nowindex );
$ Begin = $ this-> nowindex-$ plus + 1;
$ Begin = ($ begin> = 1 )? $ Begin: 1;
$ Return = '';
For ($ I = $ begin; $ I <$ begin + $ this-> pagebarnum; $ I ++)
{
If ($ I <= $ this-> totalpage ){
If ($ I! = $ This-> nowindex)
$ Return. = $ this-> _ get_text ($ this-> _ get_link ($ this-> _ get_url ($ I), $ I, $ style ));
Else
$ Return. = $ this-> _ get_text ('<span class = ". $ nowindex_style.">'. $ I. '</span> ');
} Else {
Break;
}
$ Return. = "\ n ";
}
Unset ($ begin );
Return $ return;
}
/**
* Get the code for displaying the jump button
*
* @ Return string
*/
Function select ()
{
$ Return = '<select name = "PB_Page_Select"> ';
For ($ I = 1; $ I <= $ this-> totalpage; $ I ++)
{
If ($ I ==$ this-> nowindex ){
$ Return. = '<option value = "'. $ I. '" selected>'. $ I. '</option> ';
} Else {
$ Return. = '<option value = "'. $ I. '">'. $ I. '</option> ';
}
}
Unset ($ I );
$ Return. = '</select> ';
Return $ return;
}

/**
* Obtain the limit value in the mysql statement.
*
* @ Return string
*/
Function offset ()
{
Return $ this-> offset;
}

/**
* Control the paging display style
*
* @ Param int $ mode
* @ Return string
*/
Function show ($ mode = 1)
{
Switch ($ mode)
{
Case '1 ':
$ This-> next_page = 'Next page ';
$ This-> pre_page = 'previous page ';
Return $ this-> pre_page (). $ this-> nowbar (). $ this-> next_page (). 'di '. $ this-> select (). 'page ';
Break;
Case '2 ':
$ This-> next_page = 'Next page ';
$ This-> pre_page = 'previous page ';
$ This-> first_page = 'homepage ';
$ This-> last_page = 'last page ';
Return $ this-> first_page (). $ this-> pre_page (). '[nth '. $ this-> nowindex. 'page] '. $ this-> next_page (). $ this-> last_page (). 'di '. $ this-> select (). 'page ';
Break;
Case '3 ':
$ This-> next_page = 'Next page ';
$ This-> pre_page = 'previous page ';
$ This-> first_page = 'homepage ';
$ This-> last_page = 'last page ';
Return $ this-> first_page (). $ this-> pre_page (). $ this-> next_page (). $ this-> last_page ();
Break;
Case '4 ':
$ This-> next_page = 'Next page ';
$ This-> pre_page = 'previous page ';
Return $ this-> pre_page (). $ this-> nowbar (). $ this-> next_page ();
Break;
Case '5 ':
Return $ this-> pre_bar (). $ this-> pre_page (). $ this-> nowbar (). $ this-> next_page (). $ this-> next_bar ();
Break;
}

}
/* ---------------- Private function (private method )-----------------------------------------------------------*/
/**
* Set the url header address
* @ Param: String $ url
* @ Return boolean
*/
Function _ set_url ($ url = "")
{
If (! Empty ($ url )){
// Manually set
$ This-> url = $ url. (stristr ($ url ,'? '))? '&':'? '). $ This-> page_name. "= ";
} Else {
// Automatically obtain
If (empty ($ _ SERVER ['query _ string']) {
// When QUERY_STRING does not exist
$ This-> url = $ _ SERVER ['request _ URI ']. "? ". $ This-> page_name." = ";
} Else {
//
If (stristr ($ _ SERVER ['query _ string'], $ this-> page_name. '= ')){
// The Address has page parameters.
$ This-> url = str_replace ($ this-> page_name. '='. $ this-> nowindex, '', $ _ SERVER ['request _ URI ']);
$ Last = $ this-> url [strlen ($ this-> url)-1];
If ($ last = '? '| $ Last = '&'){
$ This-> url. = $ this-> page_name. "= ";
} Else {
$ This-> url. = '&'. $ this-> page_name. "= ";
}
} Else {
//
$ This-> url = $ _ SERVER ['request _ URI '].' & '. $ this-> page_name.' = ';
} // End if
} // End if
} // End if
}

/**
* Set the current page
*
*/
Function _ set_nowindex ($ nowindex)
{
If (empty ($ nowindex )){
// System Retrieval

If (isset ($ _ GET [$ this-> page_name]) {
$ This-> nowindex = intval ($ _ GET [$ this-> page_name]);
}
} Else {
// Manually set
$ This-> nowindex = intval ($ nowindex );
}
}

/**
* Return the address value for the specified page.
*
* @ Param int $ pageno
* @ Return string $ url
*/
Function _ get_url ($ pageno = 1)
{
Return $ this-> url. $ pageno;
}

/**
* Get the text displayed by page. For example, by default, _ get_text ('<a href = ""> 1 </a> ') [<a href = ""> 1 </a>]
*
* @ Param String $ str
* @ Return string $ url
*/
Function _ get_text ($ str)
{
Return $ this-> format_left. $ str. $ this-> format_right;
}

/**
* Obtain the link address
*/
Function _ get_link ($ url, $ text, $ style = ''){
$ Style = (empty ($ style ))? '': 'Class =" '. $ style .'"';
If ($ this-> is_ajax ){
// If the AJAX mode is used
Return '<'. $ style. 'href = "javascript :'. $ this-> ajax_action_name. '(\''. $ url. '\') "> '. $ text. '</a> ';
} Else {
Return '<a'. $ style. 'href = "'. $ url.'"> '. $ text.' </a> ';
}
}
/**
* Error Handling Method
*/
Function error ($ function, $ errormsg)
{
Die ('error in file <B> '. _ FILE __. '</B>, Function <B> '. $ function. '() </B> :'. $ errormsg );
}
}
$ Page = new page (array ('Total' => 1000, 'perpage' => 20 ));
Echo 'mode: 1 <br> '. $ page-> show ();
Echo 'Echo 'Echo 'Echo '$ Ajaxpage = new page (array ('Total' => 1000, 'perpage' => 20, 'ajax '=> 'ajax _ page ', 'page _ name' => 'test '));
Echo 'mode: 1 <br> '. $ ajaxpage-> show ();
?>

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