php Codeigniter 在视图中使用 foreach
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Codeigniter using foreach in view
提问by Tessa
I'm using Codeigniter on an Apache xampp set up and attempting to use foreach in a view for the first time and I just can't get it to work.
我在 Apache xampp 设置上使用 Codeigniter 并首次尝试在视图中使用 foreach，但我无法让它工作。
My Controller code:
我的控制器代码：
class Test extends CI_Controller {
public function index($page = 'testv')
{
if ( ! file_exists(APPPATH.'/views/'.$page.'.php'))
{
show_404();
}
$this->load->model('testm');
$data['news'] = $this->testm->get_news();
$this->load->view('headder');
$this->load->view($page, $data);
$this->load->view('footer');
}
}
My Model:
我的型号：
class Testm extends CI_Model {
public function __construct()
{
parent::__construct();
}
Public function get_news()
{
$query = $this->db->query('SELECT id, date, text FROM news');
foreach ($query->result_array() as $row)
{
echo $row['id'];
echo $row['date'];
echo $row['text'];
}
}
}
My View:
我的看法：
<main id='central_section'>
<section id='logo_section'>
<img src='<?php echo base_url(); ?>img/logo.png' id='small_logo' alt="Logo">
</section>
<section id='content'>
<p class="large_headding">News</p>
<?php foreach($news as $news) { ?>
<article class="article_text">
<p class="segment_headding"><?php echo $news->date; ?></p>
<?php echo $news->text; ?>
</article>
<?php } ?>
<div id="spacer"></div>
</section>
</main>
At present I get the following warning message:
目前我收到以下警告消息：
A PHP Error was encountered
Severity: Warning
Message: Invalid argument supplied for foreach()
Filename: views/testv.php
Line Number: 18
Backtrace:
File: C:\xampp\htdocs\tsh\CI\application\views\testv.php
Line: 18
Function: _error_handler
File: C:\xampp\htdocs\tsh\CI\application\controllers\test.php
Line: 16
Function: view
File: C:\xampp\htdocs\tsh\public_html\index.php
Line: 292
Function: require_once
But the text from my database does appear at the top of the page outside of the headder so I know the database is connecting and the data from it is being collected. Can anyone tell me where I'm going wrong?
但是我的数据库中的文本确实出现在页眉之外的页面顶部，所以我知道数据库正在连接并且正在收集来自它的数据。谁能告诉我我哪里出错了？
采纳答案by Imran Qamer
you just have issue in your model function foreach loop just replace that with:
您只是在模型函数 foreach 循环中遇到问题，只需将其替换为：
$query = $this->db->query('SELECT id, date, text FROM news');
$result = $query->result_array();
return $result;
回答by Damien Pirsy
In your controller you're correctlyassigning the result of the model to a variable:
在您的控制器中，您正确地将模型的结果分配给了一个变量：
$data['news'] = $this->testm->get_news();
but in your model you're ECHOINGthe result, not RETURNINGthem. SO $data['news']is null(since the model's method doesn't return anything), and you can't iterate over null ofcourse -> and that's the error in your view. Change your model to return an array, for example:
但在模型中你呼应的结果，而不是RETURNING他们。SO$data['news']是null（因为模型的方法不返回任何内容），并且您无法遍历null of课程 -> 这就是您认为的错误。更改模型以返回数组，例如：
Public function get_news()
{
$query = $this->db->query('SELECT id, date, text FROM news');
return $query->result_array();
}
the text from my database does appear at the top of the page
我的数据库中的文本确实出现在页面顶部
because, indeed, you're echoing it (as pointed out above) before the views are outputted, that's why you see them beforethe rendered html
因为，确实，您在输出视图之前回应了它（如上所述），这就是为什么您在呈现的 html之前看到它们
回答by Damien Pirsy
please try this:
请试试这个：
in your view page:
在您的视图页面中：
<?php foreach($news->result() as $new) { ?>
<article class="article_text">
<p class="segment_headding"><?php echo $new->date; ?></p>
<?php echo $new->text; ?>
</article>
<?php } ?>
回答by Uraj
Try this for your answer:
试试这个你的答案：
your controller:
您的控制器：
public function index($page = 'testv')
{
if ( ! file_exists(APPPATH.'/views/'.$page.'.php'))
{
show_404();
}
$this->load->model('testm');
$data['news'] = $this->testm->get_news();
$this->load->view('headder');
$this->load->view($page, $data);
$this->load->view('footer');
}
model function :
模型功能：
Public function get_news()
{
$query = $this->db->query('SELECT id, date, text FROM news');
return $query;
}
in view file :
在视图文件中：
<?php foreach($news->result() as $new) { ?>
<article class="article_text">
<p class="segment_headding"><?php echo $new->date; ?></p>
<?php echo $new->text; ?>
</article>
<?php } ?>
回答by ryush00
<?php foreach($news as $new) { ?>
<article class="article_text">
<p class="segment_headding"><?php echo $new->date; ?></p>
<?php echo $new->text; ?>
</article>
<?php } ?>
Try foreach($news as $new)instead of foreach($news as $news).
尝试foreach($news as $new)代替foreach($news as $news).
回答by Omar El Don
use
用
foreach($thing as $something): //it is important if not compulsory to use a different name for variables!!
some HTML
endforeach;
instead
反而
回答by Gayan
you can use HTML compatible PHP version. that will help customize HTML code with PHP
您可以使用 HTML 兼容的 PHP 版本。这将有助于使用 PHP 自定义 HTML 代码
<?php echo $var; ?>is equal to <?= $var ?>
<?php echo $var; ?>等于 <?= $var ?>
<?php foreach($allNews as $news): ?>
<article class="article_text">
<p class="segment_headding"><?= $news->date ?></p>
<?= $news->text ?>
</article>
<?php endforeach; ?>
