Question

所以我遇到了一些我一直在构建的分页脚本的问题分页工作正常但是当我使用下一个按钮加载新页面时，我的搜索词$search_term = "%" . $_POST['searchBar'] . "%";就丢失了。有什么方法可以避免这种情况吗？或者将搜索词设置为设定值？

下一页的网址就像这样 - http://examplewebsite.com/user/Courses/SearchResultsPage.php?pn=2

对此的任何帮助将不胜感激。

分页脚本的其余部分如下;

    <?php
    $mysqli = new mysqli('localhost', 'user', 'password','db');
    if ($mysqli->connect_errno) 
    {
        die('Database connection failed');
    }
//$m->set_charset('utf8');
//here are my main changes
//turn errors on to develop, back off when you go live
error_reporting(E_ALL);
ini_set('display_errors', 1);

$search_term = "%" . $_POST['searchBar'] . "%";
$search_param = $_SESSION['$search_term']=$search_term;
$stmt =$mysqli->prepare("SELECT title, summary, id FROM course WHERE title
LIKE ?");   
$stmt->bind_param("s", $search_param); //learn this
$stmt->execute();
$result = $stmt->get_result();

//This gets the number of rows in a query result
$rows = $result->num_rows;

//number of results per page
$rows_per_page = 10;

//shows last page
$last_page = ceil($rows/$rows_per_page);
if($last_page < 1){
$last_page = 1;
}

if(isset($_GET['pn'])){
    $page_number = preg_replace('#[^0-9]#', '', $_GET['pn']);
} else {
$page_number = 1;
}

//makes sure page number is between limits of $page_number
if($page_number < 1){
    $page_number = 1;
} else if($page_number > $last_page){
    $page_number = $last_page;
}

// sets the value of items to view
$limit = 'LIMIT ' .($page_number -1) * $rows_per_page .',' .$rows_per_page;

//displays to the user the total number of results and the page numbers
$total_number_of_results = "Search Results (<b>$rows</b>)";
$page_user_is_on = "Page <b>$page_number</b> of <b>$last_page</b>";

//query again only grabbing the set number of rows depending on page number
$stmt = $mysqli->prepare("SELECT title, summary, id FROM course WHERE title LIKE ? ".$limit);   
$stmt->bind_param("s", $search_param);
$stmt->execute(); 
$result = $stmt->get_result();


$list = ''; 
while($row = $result->fetch_assoc()){
$title = $row['title'];
$id = $row['id'];
//I'm assuming you want each link to be different here...
$list.='<p><a href="Selectedcourse.php?id='.$id.'">' . $title . '</a></p>';
}
mysqli_close($mysqli);

//set up pagination
$pagination_controls = '';
if($last_page != 1){
    if($page_number > 1){
        $previous = $page_number - 1;
        $pagination_controls .='<a href="'.$_SERVER['PHP_SELF'].'?pn='.$previous.'">previous</a> &nbsp; &nbsp; ';
        for($i = $page_number - 4; $i < $page_number; $i++)
        {
            if($i > 0){
            $pagination_controls .= '<a href="'.$_SERVER['PHP_SELF'].'?pn='.$i.'">'.$i.'</a> &nbsp; ';
        }
    }
}
$pagination_controls.=''.$page_number.' &nbsp; ';

//clickable links to the left
for($i = $page_number+1; $i <= $last_page; $i++)
    {
        $pagination_controls .= '<a href="'.$_SERVER['PHP_SELF'].'?pn='.$i.'">'.$i.'</a> &nbsp; ';
        if($i >= $page_number+4){
            break;
        }
    }
    if($page_number != $last_page){
        $next = $page_number + 1;
        $pagination_controls.='&nbsp; &nbsp; <a href="'.$_SERVER['PHP_SELF'].'?pn='.$next.'">Next</a>';
    }
}
?>
<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <link rel='stylesheet' href='courses.css'>
</head>
<body>
    <div class="header">
<h1>Search Results for - <?= $search_param ?></h1>
</div>
<div>
<h3> <?php echo $page_user_is_on ?> </h3>
<p><?php echo $list; ?></p>
<p><?php /* echo $search_result['summary']; //Where was this coming from? */?> </p>
</div>
<div id="pagination_controls"><?php echo $pagination_controls; ?></div>
</body>
</html>

Answer 1

每次单击下一步，页面都会刷新，因为您不使用

<?php
session_start();
....

替换这两行

$search_term = "%" . $_POST['searchBar'] . "%";
$search_param = $_SESSION['$search_term']=$search_term;

使用：

if(isset( $_POST['searchBar'])){
   $search_term = "%" . $_POST['searchBar'] . "%";
   $search_param = $_SESSION['search'] = $search_term ;
}
else {
   $search_param = $_SESSION['search'];
}

在顶部，$_SESSION['$search_term']丢失

还为POST添加isset检查

修改

我认为你的问题是$ search_term只在加载时设置然后在下一页上它是NULL并且session也被设置为NULL。

通过PHP分页传递$ _POST值

1 个答案: