PDO 什么都不返回

Question

所以基本上我已经开始使用 OOP，而我根据教程编写的脚本给了我 2 个问题：

当我尝试将对象转换为变量时，出现此错误：

注意：尝试在第 14 行的 /home/stream/V2/templates/homepage.php 中获取非对象的属性

第14行的代码是：

<a href=".action=viewSeries&amp;seriesId=<?php echo $series->id ?>"><?php echo htmlspecialchars( $series->id ) ?></a>

第二次没有将对象转换为变量并尝试直接从中访问数据，我什么也得不到。

我基本上有 3 页来帮助从表中获取数据：

Homepage.php

    <?php include( "templates/include/header.php" ); ?>

    <ul id="headlines">

    <?php
    echo $results['totalRows'];
    foreach( $results['series'] as $series ){ ?>

    <li>
    <h2>
    <!-- remember to add htmlspecialchars -->
    <span class="title"><?php echo $results['series']->description ?></span> 

    <a href=".action=viewSeries&amp;seriesId=<?php echo $series->id ?>"><?php echo htmlspecialchars( $series->id ) ?></a>
    </h2>
    </li>


    <?php 
    } ?>

    </ul>

    <p><a href="./?action=archive">Series Archive</a></p>
    <?php include( "templates/include/footer.php" ); ?>

index.php

    <?php

require( "core/config.php" );
$action = isset ( $_GET['action'] ) ? $_GET['action'] : "";

switch ( $action ){
    case 'series':
        series();
    break;

    case 'viewSeries':
        viewSeries();
    break;

    default:
        homepage();
}

function series(){
    $results = array();
    $data = Series::getList();
    $results['series'] = $data['results'];
    $results['totalRows'] = $data['totalRows'];
    $results['pageTitle'] = "Series Title";
    require( TEMPLATE_PATH . "/series.php" );
}   

function viewSeries(){
    if( !isset( $_GET['seriesId'] ) || !$_GET['seriesId'] ){
        homepage();
        return;
    }

    $results = array();
    $results['series'] = Series::getBydId( (int)$_GET['seriesId'] );
    $results['pageTitle'] = $results['series']->title . "| Sub title";
    require( TEMPLATE_PATH . "/viewSeries.php" );
}

function homepage(){
    $results = array();
    $data = Series::getList( HOMEPAGE_NUM_SERIES );
    $results['series'] = $data['results'];
    $results['totalRows'] = $data['totalRows'];
    $results['pageTitle'] = "Streamaton Homepage";
    require( TEMPLATE_PATH . "/homepage.php");
}

这是 Series.php 类中的一段代码：

    //Return all (or range of) Series objects in the db
public static function getList( $numRows=100000, $order="id DESC" ){
    $conn = new PDO( DB_DSN, DB_USERNAME, DB_PASSWORD );
    $sql = "SELECT id, description FROM series ORDER BY :order LIMIT :numRows";
    //SQL_CALC_FOUND_ROWS *
    $st = $conn->prepare( $sql );
    $st->bindValue( ":numRows", $numRows, PDO::PARAM_INT );
    $st->bindValue( ":order", $order, PDO::PARAM_STR );
    $st->execute();
    $list = array();

    while( $row = $st->fetch() ){
        $series = new Series( $row );
        $list = $series;    
    }


    //Now get the total number of series that match the criteria
    $sql = "SELECT FOUND_ROWS() AS totalRows";
    $totalRows = $conn->query( $sql )->fetch();
    $conn =  null;
    return ( array ( "results" => $list, "totalRows" => $totalRows[0] ) );

}

整个 series.php 代码如下：http://pastebin.com/f95A8NPr

Answer 1

这个循环是错误的：

while( $row = $st->fetch() ){
    $series = new Series( $row );
    $list = $series;    
}

最后一行应该是：

    $list[] = $series;

以便它将每个系列推到数组上。您的代码每次通过循环都将数组替换为一个系列。