Question

就像标题中所说的，我的分页仅出现在首页上。

此查询从用户输入中选择总行数，然后选择他们想要的类型记录。

我想要它做的是获取记录，然后在每个页面上显示它们，但是似乎每次下一次命中它都会再次运行查询并获得一个新值。然后分页按钮（“上一个/下一个”）消失。

我一次在本地运行它就可以了。当我下一个命中时，它转到pagination.php？pn = 2，但随后出现错误

PHP注意：未定义的索引：在第5行计数 PHP注意：未定义的索引：第6行的主题 PHP警告：join（）：invaldd参数（由于上述通知，我在猜测） PHP警告：mysqli_fetch_row（）期望参数1为mysqli_result，给定为boolen（同样可能是由于第5行和第6行，并且得到了错误的值）

这是我的代码。

<?php

include ("link.php");

$limitValue = $_POST['count'];
$type = $_POST['topic'];
$qType = join("','", $type);
$query = mysqli_query($link,"SELECT count(question_id)
    FROM questions
    WHERE questionType IN ('$qType')
    LIMIT $limitValue" );
$row = mysqli_fetch_row($query);

// Assign the value of $row[0] (the results of our query, we need the square brackets for this to work) to $rows
$rows = $row[0];

$page_rows = 1;

$last = ceil($rows/$page_rows);
if($last <1){
    $last = 1;
}

$pagenum = 1;

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

if ($pagenum < 1) {
    $pagenum = 1;
}
else if ($pagenum > $last) {
    $pagenum = $last;
}

$limit = 'LIMIT ' .($pagenum - 1) * $page_rows .',' .$page_rows;
$sql = "SELECT question_id, questionType, question, answerA, answerB, answerC, answerD
    FROM questions
    WHERE questionType IN ('$qType')
    ORDER BY RAND()
    $limit";
$result = mysqli_query($link, $sql);

$paginationCtrls = '';

if($last != 1){

if ($pagenum > 1) {
    $previous = $pagenum - 1;
    $paginationCtrls .= '<a href="'.$_SERVER['PHP_SELF'].'?pn='.$previous.'" class="btn btn-default">Previous</a> &nbsp; &nbsp; ';

    for($i = $pagenum-4; $i < $pagenum; $i++){
        if($i > 0){
            $paginationCtrls .= '<a href="'.$_SERVER['PHP_SELF'].'?pn='.$i.'" class="btn btn-default">'.$i.'</a> &nbsp; ';
        }
    }
}

$paginationCtrls .= ''.$pagenum.' &nbsp; ';

for($i = $pagenum+1; $i <= $last; $i++){
    $paginationCtrls .= '<a href="'.$_SERVER['PHP_SELF'].'?pn='.$i.'" class="btn btn-default">'.$i.'</a> &nbsp; ';
    if($i >= $pagenum+4){
        break;
    }
}

if ($pagenum != $last) {
    $next = $pagenum + 1;
    $paginationCtrls .= ' &nbsp; &nbsp; <a href="'.$_SERVER['PHP_SELF'].'?pn='.$next.'" class="btn btn-default">Next</a> ';
}
}
while ($row = mysqli_fetch_array($result)) {
    echo "QID: " . $row["question_id"]. "<br>";
    "Question Type: " . $row["questionType"]. "<br><br>" ;
    "Question: " . $row["question"]. "<br><br><br>";
    echo "<input type = 'Radio' Name = 'Answer[]' value ='A' > A.   &nbsp;&nbsp;<br>";
    echo "<input type = 'Radio' Name = 'Answer[]' value ='B' > B.   &nbsp;&nbsp;<br>";
    echo "<input type = 'Radio' Name = 'Answer[]' value ='C' > C.   &nbsp;&nbsp;<br>";
    echo "<input type = 'Radio' Name = 'Answer[]' value ='D' > D.   &nbsp;&nbsp;<br><br>";
    echo "<input name='submit' type='submit' value='Submit'><br><br><hr>";
    echo $paginationCtrls;
}
?>

分页仅出现在第一页上

0 个答案: