PHP paging principle and PHP paging code comprehensive examples

/**
* PHP pagination code
**/
/**
* Link to database
* bbs.it-home.org
* @param string $strHost database server host address
* @param string $strAccount database account
* @param string $strPassword database password
* @return resource
**/
function mysqlConnect($strHost,$strAccount,$strPassword,$strDBname)
{
 $strHost=trim ($strHost);
 $strAcount=trim($strAccount);
 $strPassword=trim($strPassword);
 $resLink=mysql_connect($strHost,$strAccount,$strPassword);
 if(!$resLink)
 {
 return false;
 }
 else
 { //set names ... set according to the encoding of the database
 mysql_query('set names utf8',$resLink);
 $isValidate=mysql_select_db($strDBname,$resLink);
 if($isValidate)
 {
 return $resLink;
 }
 else
 {
 return false;
 }
 }
}
/**
*Accept the current page number of paging and calculate the corresponding parameter value
*Include: start page number $arrParameter['start']
* End page number $arrParameter['end']
* Total number of records $arrParameter['all' ]
* Number of records displayed on each page $arrParameter['nums']
* Number of links displayed on the page $arrParameter['links']
* SQL statement to be queried $arrParameter['sql']
* Type of paging bar $arrParameter['tag']
*
int $intPage Current page number value
int $intNums Number of records displayed on each page
int $intLinks Number of links displayed on the page
string $strTablename Display data table in pages
resource $resLink Data connection handle
array
**/
function calculateParamester($intPage,$intNums,$intLinks, $strTablename,$resLink){
 $intPage=(int)$intPage;
 $intNums=(int)$intNums;
 $intLinks=(int)$intLinks;
 //When the number of displayed links is not an odd number, adjust it to an odd number.
 if($intLinks % 2 == 0){
 $intLinks--;
 }
 //Adjust to 10 when the number of records displayed on each page is not greater than 0
 if($intNums <= 0){
 $intNums =10;
 }
 //Calculate the total number of pages
 $strSql1="select count(*) as num from `{$strTablename}`";
 $resObj1=mysql_query($strSql1,$resLink);
 $arrObj1 =mysql_fetch_assoc($resObj1);
 $intAllRecords=$arrObj1['num'];
 $intAllPage=ceil($intAllRecords/$intNums);
 //The first parameter of the sql statement limit keyword
 $intOffset=( $intPage-1)*$intNums;
 //Only display the previous page and next page, that is, the number of links displayed is not greater than 0
 if($intLinks <= 0){
 $strSql2="select * from ` {$strTablename}` limit {$intOffset},{$intNums}";
 $arrParameter['start']=null;
 $arrParameter['end']=null;
 $arrParameter['page']=$intPage ;
 $arrParameter['nums']=$intNums;
 $arrParameter['links']=null;
 $arrParameter['all']=$intAllPage;
 $arrParameter['sql']=$strSql2;
 $ arrParameter['tag']=1;
 //When the paging barcode is displayed, that is, the number of links displayed is greater than 0
 }else{
 //When the total records are greater than 0
 if($intAllPage > 0){
 //Determine the value of the current page number
 if($intPage <= 0){
 $intPage=1;
 }
 if($intPage >= $intAllPage){
 $intPage=$intAllPage;
 }
 $ intHalfLinks=floor($intLinks/2);
 //Calculate the value of the start page number
 $intStartPage=$intPage-$intHalfLinks;
 if($intStartPage <= 0){
 $intStartPage=1;
 }
 if( ($intAllPage-$intPage) < $intHalfLinks){
 //$intStartPage=$intPage-$intHalfLinks-($intHalfLinks-($intAllPage-$intPage));
 //$intStartPage=$intPage-$intHalfLinks- $intHalfLinks+$intAllPage-$intPage;
 $intStartPage=$intAllPage-2*$intHalfLinks;
 }
 //Calculate the value of the end page number
 $intEndPage=$intPage+$intHalfLinks;
 if($intEndPage < $intLinks && $ intAllPage > "select * from `{$strTablename}` limit {$intOffset},{$intNums}";
 $arrParameter['start']=$intStartPage;
 $arrParameter['end']=$intEndPage;
 $arrParameter[ 'page']=$intPage;
 $arrParameter['nums']=$intNums;
 $arrParameter['links']=$intLinks;
 $arrParameter['all']=$intAllPage;
 $arrParameter['sql ']=$strSql2;
 $arrParameter['tag']=2;
 //When the total records are equal to 0
 }else{
 $arrParameter['start']=null;
 $arrParameter['end' ]=null;
 $arrParameter['page']=null;
 $arrParameter['nums']=null;
 $arrParameter['links']=null;
 $arrParameter['all']=null;
 $ arrParameter['sql']=null;
 $arrParameter['tag']=3;
 }
 }
 return $arrParameter;
}
/**
* Create paging bar
*
* @param int $intPage The currently displayed page number value
* @param int $intStartPage The starting page number
* @param int $intEndPage The ending page number
* @param int $intAllRecords The total number of records
* @param int $intTag paging bar type tag
* @return string
**/
function createPagingItem($intPage,$intStartPage,$intEndPage,$intAllPage,$intTag){
 $strPageItem='';
 //Only display the previous page and the next page. The number of links displayed is not greater than 0
 if($intTag == 1){
 if($intAllPage <= 0){
 $strPageItem.='Homepage  Last Page';
 }else{
 if( $intPage == 1){
 $strPageItem.="Home  Previous page";
 $strPageItem.="  ";
 }else{
 $strPageItem.="Homepage";
 $strPageItem.="  ";
 $strPageItem.="Previous page";
 $strPageItem.="  ";
 }
 if($intPage == $intAllPage){
 $strPageItem.="Next page   Last page";
 }else{
 $strPageItem.="Next page";
 $strPageItem.="  ";
 $strPageItem.="Last page";
 }
 }
 }
 //When displaying paging barcode, the number of links displayed is greater than 0
 if($intTag == 2){
 if($intPage == 1){
 $strPageItem.="Homepage   Previous page";
 $strPageItem.="  ";
 }else{
 $strPageItem.="Homepage";
 $ strPageItem.="  ";
 $strPageItem.="Previous page";
 $ strPageItem.="  ";
 }
 for($i=$intStartPage;$i<=$intEndPage;$i++){
 if($i == $intPage){
 $strPageItem.=$i ;
 }else{
 $strPageItem.="[".$i."]";
 }
 $strPageItem.="   ";
 }
 if($intPage == $intAllPage){
 $strPageItem.="Next page  Last page";
 }else{
 $strPageItem.="Next page";
 $strPageItem.="  ";
 $strPageItem.="Last page";
 }
 }
 //When the total records are equal to 0
 if($intTag == 3){
 $strPageItem.='Home page =mysql_query($strSql,$resLink);
 $arrObj=array();
 $strOutPutData='';
 $arrFieldsCode=array_keys($arrFields);
 while(@$arrRow=mysql_fetch_assoc($resObj)){
 $arrObj[]=$arrRow;
 }
 $strOutPutData.=""; $strOutPutData.=''; foreach($arrFieldsCode as $strVal){  $strOutPutData.=""; } $strOutPutData.=""; foreach($arrObj as $arrVal){ $strOutPutData.=""; foreach($arrFieldsCode as $strVal){ $strOutPutData.=""; } $strOutPutData.=""; } $strOutPutData.="


".$arrFields[trim($strVal)]."





".$arrVal[trim($strVal)]." 



";
 return $strOutPutData;
}
// Connect and select the database
// Note: You should modify the database account and password as well as the database name
$resLink=mysqlConnect('localhost','root','root','ztlibrary');
// Find out Note on paging parameters: You should modify the data table name
$arrParameter=calculateParamester(@$_GET['page']?$_GET['page']:1,
10,5,'book_info',$resLink);
/ /The data to be displayed is composed of the field name of the table and its key value. The Chinese interpretation of the field name is its element value
//Note: You should modify the following array according to your data table
$arrFields=array('Id_code' =>'Book_name'=>'Book name',
'Book_ISBN'=>'ISBN','Contribute_man'=>'Source','Issue_time'=>'Publication time' ,'Storing_time'=>'Storing time');
?>


"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">


php paging demonstration--www.yuju100.com




< ;div>
//Output paging data
echo outPutData($arrParameter['sql'],$arrFields,$resLink);
?>

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