Summary of commonly used paging classes in PHP_PHP tutorial
Pagination is by far the best way to display large numbers of results. With the help of the following codes, developers can display large amounts of data in multiple pages. On the Internet, paging is generally used for search results or browsing all information
php basic paging
The code is as follows | Copy code | ||||
$conn = mysql_connect('localhost','dbusername','dbpass') or trigger_error("SQL", E_USER_ERROR); $db = mysql_select_db('dbname',$conn) or trigger_error("SQL" , E_USER_ERROR);// find out how many rows are in the table $sql = "SELECT COUNT(*) FROM numbers"; $result = mysql_query($sql, $conn) or trigger_error("SQL", E_USER_ERROR); $r = mysql_fetch_row($result); $numrows = $r[0];// number of rows to show per page $rowsperpage = 10; // find out total pages $totalpages = ceil($numrows / $rowsperpage);// get the current page or set a default if (isset($_GET['currentpage']) && is_numeric($_GET['currentpage'])) { // cast var as int $currentpage = (int) $_GET['currentpage']; } else { // default page num $currentpage = 1; } // end if// if current page is greater than total pages... if ($currentpage > $totalpages) { // set current page to last page $currentpage = $totalpages ; } // end if // if current page is less than first page... if ($currentpage // set current page to first page $currentpage = 1; } // end if// the offset of the list, based on current page $offset = ($currentpage - 1 ) * $rowsperpage;// get the info from the db $sql = "SELECT id, number FROM numbers LIMIT $offset, $rowsperpage"; $result = mysql_query( $sql, $conn) or trigger_error("SQL", E_USER_ERROR);// while there are rows to be fetched... while ($list = mysql_fetch_assoc($result)) { // echo data echo $list['id'] . " : " . $list['number'] . " "; } // end while/****** build the pagination links ******/ // range of num links to show $range = 3;// if not on page 1, don't show back links if ($currentpage > 1) { // show echo " "; // get previous page num $prevpage = $currentpage - 1; // show echo " "; } // end if// loop to show links to range of pages around current page for ($x = ($currentpage - $range); $x < ; (($currentpage + $range) + 1); $x++) { // if it's a valid page number... if (($x > 0) && ($x < ;= $totalpages)) { // if we're on current page... if ($x == $currentpage) { // 'highlight' it but don' t make a link echo " [$x] "; // if not current page... } else { // make it a link echo " $x "; } // end else } // end if } // end for// if not on last page, show forward and last page links if ($currentpage != $totalpages ) { // get next page $nextpage = $currentpage + 1; // echo forward link for next page echo " > "; // echo forward link for lastpage echo " >> "; } // end if /****** end build pagination links ******/ ? > |
Let’s first look at a commonly used PHP paging class
The code is as follows | Copy the code |
/* $tbl_name=""; //your table name "; n"; //previous button if ($page > 1) $pagination.= "� previous"; else $pagination.= "� previous"; //pages if ($lastpage { for ($counter = 1; $counter { if ($counter == $page) $pagination.= "$counter"; else $pagination.= "$counter"; } } elseif($lastpage > 5 + ($adjacents * 2)) //enough pages to hide some { //close to beginning; only hide later pages if($page { for ($counter = 1; $counter { if ($counter == $page) $pagination.= "$counter"; else $pagination.= "$counter"; } $pagination.= "..."; $pagination.= "$lpm1"; $pagination.= "$lastpage"; } //in middle; hide some front and some back elseif($lastpage - ($adjacents * 2) > $page && $page > ($adjacents * 2)) { $pagination.= "1"; $pagination.= "2"; $pagination.= "..."; for ($counter = $page - $adjacents; $counter { if ($counter == $page) $pagination.= "$counter"; else $pagination.= "$counter"; } $pagination.= "..."; $pagination.= "$lpm1"; $pagination.= "$lastpage"; } //close to end; only hide early pages else { $pagination.= "1"; $pagination.= "2"; $pagination.= "..."; for ($counter = $lastpage - (2 + ($adjacents * 2)); $counter { if ($counter == $page) $pagination.= "$counter"; else $pagination.= "$counter"; } } } //next button if ($page $pagination.= "next �"; else $pagination.= "next �"; $pagination.= " } ?> while($row = mysql_fetch_array($result)) =$pagination?> |
Example
The code is as follows | Copy code |
class PageView{ $this->totalNum = $count;//Total number of records $this->hasNextPage = $this->pageNo >= $this->pageCount ?false:true; }else if($this->pageNo > $this->pageCount - 4){ /*** "; if(!empty($pageList)){ if($this->pageCount >1){ if($this->hasPrePage){ $pageString = $pageString ."jsFunction . "(" . ($this->pageNo-1) . ")">上一页"; } foreach ($pageList as $k=>$p){ if($this->pageNo == $p){ $pageString = $pageString ."" . $this->pageNo . ""; continue; } if($p == -1){ $pageString = $pageString ."..."; continue; } $pageString = $pageString ."jsFunction . "(" . $p . ")">" . $p . ""; } if($this->hasNextPage){ $pageString = $pageString ."jsFunction . "(" . ($this->pageNo+1) . ")">下一页"; } } } $pageString = $pageString .(" return $pageString; } } ?> |
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Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.

The main advantages of using database storage sessions include persistence, scalability, and security. 1. Persistence: Even if the server restarts, the session data can remain unchanged. 2. Scalability: Applicable to distributed systems, ensuring that session data is synchronized between multiple servers. 3. Security: The database provides encrypted storage to protect sensitive information.

Implementing custom session processing in PHP can be done by implementing the SessionHandlerInterface interface. The specific steps include: 1) Creating a class that implements SessionHandlerInterface, such as CustomSessionHandler; 2) Rewriting methods in the interface (such as open, close, read, write, destroy, gc) to define the life cycle and storage method of session data; 3) Register a custom session processor in a PHP script and start the session. This allows data to be stored in media such as MySQL and Redis to improve performance, security and scalability.

SessionID is a mechanism used in web applications to track user session status. 1. It is a randomly generated string used to maintain user's identity information during multiple interactions between the user and the server. 2. The server generates and sends it to the client through cookies or URL parameters to help identify and associate these requests in multiple requests of the user. 3. Generation usually uses random algorithms to ensure uniqueness and unpredictability. 4. In actual development, in-memory databases such as Redis can be used to store session data to improve performance and security.

Managing sessions in stateless environments such as APIs can be achieved by using JWT or cookies. 1. JWT is suitable for statelessness and scalability, but it is large in size when it comes to big data. 2.Cookies are more traditional and easy to implement, but they need to be configured with caution to ensure security.


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