html标签中的PHP foreach

Question

我正在从数据库中提取数据，然后将其显示在我的 html 页面上。我曾认为我下面的代码可以工作，并且它可以获取数据并将其放入变量中。尝试将变量注入 html 标记时，它会崩溃。我还可能错误地假设通过将我的 html 标签放在 php foreach 循环中，它将根据返回的行数动态创建所需的所有标签。我需要 foreach，因为数据是一个数组，所以要获取每条记录，我需要查看数组。

我将这段代码放在我想要放置元素的 body 标记中。

body 标签中的 PHP 函数位于元素所在的部分。

                        <?php
                            function db_connect() {

                                // Define connection as a static variable, to avoid connecting more than once 
                                static $connection;

                                // Try and connect to the database, if a connection has not been established yet
                                if(!isset($connection)) {
                                     // Load configuration as an array. Use the actual location of your configuration file
                                    $config = parse_ini_file('\assets\con_config.ini'); 
                                    $connection = mysqli_connect('localhost',$config['username'],$config['password'],$config['dbname']);
                                }

                                // If connection was not successful, handle the error
                                if($connection === false) {
                                    // Handle error - notify administrator, log to a file, show an error screen, etc.
                                    return mysqli_connect_error(); 
                                }
                                return $connection;
                            }

                            function db_query($query) {
                                // Connect to the database
                                $connection = db_connect();

                                // Query the database
                                $result = mysqli_query($connection,$query);

                                return $result;
                            }

                            function db_select($query) {
                                $rows = array();
                                $result = db_query($query);

                                // If query failed, return `false`
                                if($result === false) {
                                    return false;
                                }

                                // If query was successful, retrieve all the rows into an array
                                while ($row = mysqli_fetch_assoc($result)) {
                                    $rows[] = $row;
                                }
                                return $rows;
                            }

                            $rows = db_select("select CONCAT_WS(' ', fname, mname, lname) as author_name, title, image_location, rating, review, (Select mid(date_reviewed,1,2) from reviews where reviews.book_id = books.id) as day, (Select mid(date_reviewed,4,3) from reviews where reviews.book_id = books.id) as month, (Select mid(date_reviewed,8,2) from reviews where reviews.book_id = books.id) as year, sellers_site, twitter_site, fb_site, twitter_id, fb_id, genre from authors, books, book_genre, book_link, reviews, social_media where books.author_id = authors.id and book_genre.book_id = books.id and book_link.book_id = books.id and reviews.book_id = books.id and social_media.author_id = authors.id group by ireviews.reviews.date_reviewed ASC");
                            if($rows === false) {
                                $error = db_error();
                                // Handle error - inform administrator, log to file, show error page, etc.
                            }

                                //foreach($rows as $value){

                                    //echo $value['author_name'] . "<br />\n";
                                    //echo $value['title'] . "<br />\n";
                                    //echo $value['rating'] . "<br />\n";
                                //}

                        ?>
                        
                        <? php foreach($rows as $value); ?>

用于显示返回数据的 HTML 部分。

<? php foreach($rows as $value); ?>
                    
                    <div class="block">
                        <div class="row">
                            <div class="col-md-4 col-md-8">
                                <div class="widget-block">
                                    <input id="rate1" value="<?php echo $value['rating']?>" type="number" class="rating" data-max="5" data-min="0"  data-size="sm" data-show-clear="false" readOnly="readOnly">
                                    <a href="<?php echo $value['sellers_site']?>" target="#"><img class="img-responsive wow fadeInLeftBig animated" data-wow-duration="1.5s" src="<?php echo $value['$image_location']?>" alt="<?php echo $value['$author_name']?>"></a>
                                    <br>
                                    <a href="<?php echo $value['sellers_site']?>" class="btn btn-success" target="_blank">Buy this book</a>
                                </div>
                            </div>
                            <div class="col-md-6 col-md-8">
                                <div class="section-sub-title">
                                    <article class="section-title-body white">
                                        <h1 class="head-title">Author: <span><?php echo $value['$author_name']?> -</span> <?php echo $value['$title']?></h1>
                                        <span class="point-line hidden-xs hidden-sm"></span>
                                        <p>
                                            <?php echo $value['$review']?>
                                        </p>
                                    </article>
                                </div>
                            </div>
                        </div>   
                    </div>
                    <?php } ?>

谢谢！

Answer 1

您的foreach 中的“php 关键字之间有一个空格，而且同一行的末尾没有左括号或冒号。尝试类似：

<?php foreach($rows as $value): ?>
    ....
<?php endforeach; ?>

Answer 2

我也可能错误地假设通过放置我的 html 标签 在 php foreach 循环中，它将动态创建所有 需要的标签取决于返回的行数。

这正是它的工作原理，除了你犯了一些sintax错误：

1：

<? php

应该是

<?php

2：

foreach($rows as $value); ?>

应该是这样的

foreach($rows as $value){ ?>

此外，如果您使用的是现代版本的 PHP (5.4+)，您可以使用简短的 php 标签和简短的输出。

这个

value="<?php echo $value['rating']?>"

等于

value="<?=$value['rating']?>"

Answer 3

尝试将您的 foreach 更改为：

foreach($rows as $value) { ?>