php 回显循环，无法回显定义中的存储值

Question

The following code displays the news article date, title/header, and article.

<h2><?php echo(LATEST_NEWS_ARTICLE_DATE_10);?>&nbsp;&nbsp;&nbsp;
<?php echo(LATEST_NEWS_ARTICLE_HEADER_10);?></h2>
<p><?php echo(LATEST_NEWS_ARTICLE_10);?>

....articles 9 through to 2.....

<h2><?php echo(LATEST_NEWS_ARTICLE_DATE_1);?>&nbsp;&nbsp;&nbsp;
<?php echo(LATEST_NEWS_ARTICLE_HEADER_1);?></h2>
<p><?php echo(LATEST_NEWS_ARTICLE_1);?>

displays:-

article 10:-

31st March 2021 PHP Loop still issues

Whats going on with this loop still

....articles 9 to 2....

article 1:- 31st March 2020 PHP Loop

Whats going on with this loop

but rather than type the code out for each article (eventually 20 articles per page, multi pages), thought I would use a loop.

<?php
for ($x = 10; $x > 0; $x--) {
echo (LATEST_NEWS_ARTICLE_DATE_.$x)."&nbsp;&nbsp;&nbsp;&nbsp;";
echo (LATEST_NEWS_ARTICLE_HEADER_.$x)."<br>";
echo (LATEST_NEWS_ARTICLE_.$x)."<br><br>";
}
?>

This should display the latest article 10, to the oldest article 1, but instead it displays

LATEST_NEWS_ARTICLE_DATE_10 LATEST_NEWS_ARTICLE_HEADER_10 LATEST_NEWS_ARTICLE_10

.....articles 9 through to 2.....

LATEST_NEWS_ARTICLE_DATE_1 LATEST_NEWS_ARTICLE_HEADER_1 LATEST_NEWS_ARTICLE_1

I must be missing something as its so close. Any help including tutorials to try would be appreciated, I haven't been able to find something yet.

Answer 1

This won't work the way you expect it to work - PHP will always evaluate your construct to the value of a constant named LATEST_NEWS_ARTICLE_ plus the value of the variable $x .

You're on the right track using a loop to iterate over a data set, though, but to store the data, you should definitely use a variable, not a constant (cf. DEFINE vs Variable in PHP ).

The most obvious choice would be an array, eg:

$latest_articles = [

    ['date' => '...', 'header' => '...', 'body' => '...'],
    ['date' => '...', 'header' => '...', 'body' => '...']
];

Later in your code, you could simply loop over it with foreach :

foreach ($latest_articles as $article) {

    echo($article['date']);
    echo($article['header']);
    ...    
}