while循环内的while循环仅返回第一行

Question

我试图使数组充满不同的对象。 我有一组页面和一组问题。 页面是组，问题属于它们。

我想查询第一页，然后找出其中有多少个问题。 之后，为每个问题创建对象并将其附加到特定页面。

// first get pages so we get grouping and order
$getPages = $conn->prepare("SELECT * FROM pages WHERE event_id = :event_id ORDER BY page_order ASC");
$getPages->bindParam(":event_id", $_SESSION['event_id']);
$getPages->execute();
$pageCount = $getPages->rowCount();
$pages = array();

// get pages
while ($row = $getPages->fetch()) {
    $page = array();
    $page['id'] = $row['id'];
    $page['order'] = $row['page_order'];

    // query for that page
    $stmt = $conn->prepare("SELECT * FROM questions WHERE page_id = :page_id");
    $stmt->bindParam(":page_id", $page['id']);
    $stmt->execute();
    while ($getQuestions = $stmt->fetch()) {
        $question = array();
        $question['id'] = $getQuestions['id'];
        $question['content'] = $getQuestions['content'];
        // push question into questions
        $page['questions'] = $question;
    }

    // push page into pages
    $pages[] = $page;
}

//print pages
echo json_encode($pages);

但是可悲的是，每页只返回一行...

Answer 1

这是因为您的问题每次都会覆盖。 如下更改代码

<?php
$page['questions'] = array();
 while ($getQuestions = $stmt->fetch()) {
        $question = array();
        $question['id'] = $getQuestions['id'];
        $question['content'] = $getQuestions['content'];

        // push question into questions
        $page['questions'][] = $question;        
    }