Automatically list wp posts

You can list automatically wordpress posts in your php webpage, based on its tags.

The following php code allow you to list all wp posts with a given tag:

<?php

// --- 1️⃣ Caricamento WordPress (solo se non già caricato) ---
if (!function_exists('get_posts')) {
    $possible_paths = [
        __DIR__."/../[your-wp-path]/wp-load.php",  // standard
        __DIR__."/../../[your-wp-path]/wp-load.php", // if you inclyde subfolders
    ];
    foreach ($possible_paths as $path) {
        if (file_exists($path)) {
            require_once($path);
            break;
        }
    }
}

// --- 2️⃣ Preparazione query ---
global $post;
$args = [
    'posts_per_page' => 200,
];

if (!empty($whatcategory)) {
    $args['category_name'] = $whatcategory; // category slug 
}
if (!empty($whattag)) {
    // $args['tag'] = $whattag; 
    $args['tag_slug__in'] = array_map('trim', explode(',', $whattag)); // tag slug (not shown names)
}

// --- 3️⃣ Cache opzionale (transient WordPress) ---
$cache_key = 'lista_blog_' . ($whatcategory ?? 'none') . '_' . ($whattag ?? 'none');
$myposts = get_transient($cache_key);

if ($myposts === false) {
    $myposts = get_posts($args);
    set_transient($cache_key, $myposts, 3600); // cache 1 ora
}

// --- 4️⃣ Output ---
if (!empty($myposts)) {
    echo '<h2>
        <span lang="en">Our blog posts about this topic</span>
        <span lang="it">Posts del nostro blog su questo tema</span>
    </h2>
    <ul id="blog-posts">';

    foreach ($myposts as $post) {
        // Non dipendiamo dal loop globale
        echo '<li><a href="'.get_permalink($post).'" rel="bookmark">'.get_the_title($post).'</a></li>';
    }

    echo '</ul>';
    wp_reset_postdata();
}
?>

You can put this code in a separate file, and include it in your php webpage, i.g. in the footer, with a code like the following:

<?php
$listablog = "[the-path-of-your-separate-file/the-name-of-your-separate-file";
  if (file_exists($listablog)) {
    if (
        (isset($whatcategory) && !empty($whatcategory)) ||
        (isset($whattag) && !empty($whattag))
    ) {
        include $listablog;
    }
  }
?>

In the header of a webpage where you want add this list, you have to set the value of the tag you want list:

$whattag="your tag,another tag";

Be careful: you has to set, as value, not the visualized tag name, but the “slug”. You can see it also with mouse hover and status bar.