PHP paging a simple implementation of the simplest PHP page code

PHP paging code in a variety of program development is necessary to use, in the development of the Web site is a necessary choice.

To write the paging code, first you have to understand the SQL query statement: SELECT * from goods limit 2, 7. PHP Paging code core is to expand around this statement, SQL statement Description: Query goods data table from the 2nd data start to remove 7 data. In the pagination code, 7 indicates how many items are displayed per page, 2 uses the formula to calculate the number of page turns, and by passing in different parameters to replace the value "2", you can filter out different data.

index.php:

include' conn.php ';//Introducing Database Operations Classes $conn=NewConn ();//instantiating a database operation class $total=$conn->getone (' Select COUNT (*) as total from goods ');$total=$total[' Total '];//Goods table Data total data Bar number$num= 6;//show number of bars per page$totalpage=Ceil($total/$num);//Count Pagesif(isset($_get[' Page ']) &&$_get[' Page ']<=$totalpage){//here is a judgment, if get to the data and the data is less than the total number of pages to pay the current page parameters, otherwise jump to the first page    $thispage=$_get[' Page '];}Else{    $thispage=1;}<br>//note the red part of the SQL statement below, calculated to determine from the first few data to take out, the current page minus 1 multiplied by the number of data bars per page$sql= ' Select Goods_id,goods_name,shop_price from Goods order by goods_id limit '. <span style= "color: #ff0000;" > ($thispage-1) *$num</span>. ', '.$num.‘‘; $data=$conn->getall ($sql); foreach($data  as $k=$v){    Echo' <li> '.$v[' goods_id ']. ', '.$v[' Goods_name ']. ' ---￥ '.$v[' Shop_price ']. ' </li> '; }<br>//display a numbered list of pages for($i= 1;$i<=$totalpage;$i++){    Echo' <a href= '? page= '.$i.‘" > '.$i.‘ </a> '; }

The code above implements one of the simplest PHP paging effects:

Only realize the click-to-turn digital display different paging data, can be further improved on this basis, as long as the basic principles of understanding, follow-up work is relatively easy to develop.

conn.php Code:

/** Connect database for related query operation*/ classconn{ Public function__construct () {include_once(' config.php '); Try{               $this->pdo =NewPDO (' Mysql:host=localhost;dbname=test ', ' root ', ' 123456 '); $this->pdo->setattribute (Pdo::attr_errmode, PDO::errmode_exception); $this->pdo->exec(' Set names UTF8 '); }Catch(pdoexception$e){            Echo' Database connection failed: '.$e-GetMessage (); Exit(); }    }         //get a row of data     Public functionGetOne ($sql){        $rs=$this->pdo->query ($sql)->fetch (PDO::FETCH_ASSOC); return $rs; }         //get multiple rows of data results     Public functionGetAll ($sql){        $rs=$this->pdo->query ($sql)->fetchall (PDO::FETCH_ASSOC); return $rs; }}

conn.php function is to complete the database connection, and implementation of data extraction operation method, here I use PDO, here can be used to organize code according to people.

config.php:

/* * Configuration Database Information */ $cfg _dbhost= ' localhost '; $cfg _dbname= ' Test '; $cfg _dbuser= ' root '; $cfg _dbpw= ' 123456 ';

PHP paging a simple implementation of the simplest PHP page code