In WordPress, you can show blog posts through filters with PHP by using the WP_Query class to query the posts and the get_posts() function to retrieve the filtered posts, and then using a loop to display the posts.

Here’s an example of how you can use the WP_Query class to filter posts by category and display them on a page:

$args = array(
    'category_name' => 'category-slug',
    'post_status' => 'publish',
    'posts_per_page' => -1,
    'order' => 'DESC',
    'orderby' => 'date',
);
$query = new WP_Query( $args );
if ( $query->have_posts() ) {
    while ( $query->have_posts() ) {
        $query->the_post();
        // Display the post content here
        the_title();
        the_content();
    }
    wp_reset_postdata();
}

This example is filtering the posts by the category slug “category-slug”, and it will retrieve all published posts that belong to that category, the number of posts is set to -1, it will retrieve all the posts, and the order is set to descending and order by date.

You can also filter the posts by other parameters like author, tag, post type, date, and more.

You can also use the get_posts() function to retrieve filtered posts and then use a loop to display the posts.

$args = array(
    'category_name' => 'category-slug',
    'post_status' => 'publish',
    'numberposts' => -1,
    'order' => 'DESC',
    'orderby' => 'date',
);
$posts = get_posts( $args );
foreach ( $posts as $post ) {
    // Display the post content here
    the_title();
    the_content();
}

It’s important to note that the get_posts() function retrieves an array of post objects, whereas the WP_Query class retrieves a custom object, but both have similar functionality.

You can also use the pre_get_posts action filter to modify the main query and retrieve only the posts that meet certain criteria.

You can also use the query_vars filter to add new variables to the query, that allows you to filter posts by custom fields or taxonomies.

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