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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →The WordPress Loop is the code that turns a query’s results into the posts, pages, or custom post types visitors see. The main query is built for the current URL, and a theme’s template consumes it one post at a time with have_posts() and the_post(). To change that main result set, modify the query before it runs with pre_get_posts; to display an additional list, create a separate WP_Query or get_posts() query and restore the original post context afterward.
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Understanding which query you are changing, when it runs, and whether it changes global post state prevents the most common Loop bugs: missing pagination, incorrect titles or links, duplicated posts, and template tags showing data from the wrong post.
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WordPress builds a query from the requested front-end URL. A home page, category archive, search results page, author archive, date archive, or singular post request each produces a main query with its own query variables and result set. The selected template then uses the Loop to read those results and render markup.
The WordPress Theme Handbook describes the Loop as “the default mechanism WordPress uses for outputting posts through a theme’s template files.” In practical terms, the Loop is an iteration over the posts returned by the current query. It does not decide which posts should exist by itself; it reads the query that has already been prepared and exposes one result at a time to template tags.
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A minimal Loop has four parts:
- Check whether another result is available with
have_posts(). - Advance to that result with
the_post(). - Output fields such as the title, content, author, date, and permalink.
- Provide an empty-state branch when no result exists.
The same pattern works with the global main query and with a secondary WP_Query object. The method names look similar, but the object on which they are called determines which result set is being consumed.
The basic Loop, line by line
<?php
if ( have_posts() ) :
while ( have_posts() ) :
the_post();
the_title();
the_content();
endwhile;
else :
echo 'No posts found.';
endif;
?>have_posts() checks availability
On the main query, have_posts() checks whether another post is available for the Loop. It returns a Boolean value. A true result allows the loop body to run; a false result sends execution to the else branch or ends the while loop.
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It is a stateful check, not a database query you should treat as a harmless look-ahead. When the query reaches the end of its results, WP_Query::have_posts() returns false, fires the loop_end action, and rewinds the posts. That rewind means a later check can start from the beginning again. Calling have_posts() unexpectedly inside a loop can therefore alter the point at which you think iteration is occurring.
the_post() advances and sets context
the_post() advances the query’s internal pointer to the next result and sets up the current post. Template tags such as the_title(), the_content(), the_author(), the_permalink(), and date or taxonomy tags then read the post that the_post() selected.
The function also updates the global post context used by many template functions. That is why a secondary Loop can make code after it display the secondary post’s title or link unless you restore the original context.
The loop body runs once per returned post
Everything between the_post() and endwhile runs for each result. Put the complete card or article structure there, including the heading, link, metadata, excerpt, thumbnail, and content you want repeated. Put page-level wrappers outside the Loop so they are not emitted once per post.
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The empty branch is part of a complete Loop
A query can legitimately return zero posts. Search terms, empty archives, unpublished content, restrictive taxonomies, and custom filters all create this situation. Keep an explicit empty-state branch and give it useful output, such as a heading explaining that no matching posts were found and a search form or navigation back to a broader archive.
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How the main query reaches the template
For a front-end request, WordPress parses the URL into query variables, constructs the main WP_Query, and chooses a template through the theme’s template hierarchy. The chosen template’s primary Loop consumes that main query. Archive templates commonly list many posts; a singular template normally receives one post; search templates receive the results matching the search request.
The important distinction is that the main query represents the page the visitor requested. Its variables include information such as the post type, taxonomy, search term, date, author, page number, and posts-per-page setting. Replacing that query inside a template can discard information that WordPress derived from the URL, which is why the method used to customize it matters.
In a normal theme, do not instantiate a new query merely to replace the archive’s existing results. Adjust the existing main query before it executes, or leave it alone and create a separate query for an additional component such as a “related posts” block.
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Customize the main query with pre_get_posts
Use the pre_get_posts action when the goal is to change which posts the requested page displays. The hook runs after WordPress has created the query variables but before the database query runs, so changing a parameter there affects the SQL that retrieves the main results.
<?php
function my_archive_size( $query ) {
if ( ! is_admin() && $query->is_main_query() && $query->is_archive() ) {
$query->set( 'posts_per_page', 15 );
}
}
add_action( 'pre_get_posts', 'my_archive_size' );
?>Why each condition matters
! is_admin()limits the change to front-end requests. Without it, an archive setting intended for visitors could also affect administration screens.$query->is_main_query()prevents the callback from changing every query that happens to run during the request. Sidebars, footers, widgets, REST requests, and plugins can all create additional queries.$query->is_archive()narrows the change to archive requests. Replace it with the appropriate conditional method when your rule applies only to a search, a specific post type archive, or another request type.$query->set( 'posts_per_page', 15 )changes a query variable before retrieval. The number is an example setting; choose the value that fits your design and pagination plan.
Use conditional methods on the passed $query object rather than assuming the global query is the one being filtered. The callback may run for several queries during one request, and broad changes can produce failures far from the template where the code was written.
Changing archive filters safely
You can set other query variables in the same way when the requirement is to change the main archive’s result set. Typical examples include restricting a post type archive, adding a taxonomy constraint, changing ordering, or changing the number of posts per page. Keep the rule specific to the intended request and test the first page and later pages.
Pagination is part of the main query’s behavior. If you change the result count or filters before SQL runs, WordPress can calculate the number of pages from the modified query. Avoid designs that use an arbitrary offset unless you also account for how that offset changes page counts and which posts appear on every page.
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Create an additional Loop with WP_Query
Use a secondary query when the page should keep its main results and also show another set of posts. A related-content panel, a news feed in a game article, or a list of posts from a particular category are separate-content use cases.
<?php
$related = new WP_Query( [
'posts_per_page' => 5,
'category_name' => 'news',
] );
if ( $related->have_posts() ) :
while ( $related->have_posts() ) :
$related->the_post();
the_title( '<h2>', '</h2>' );
endwhile;
else :
echo 'No related posts found.';
endif;
wp_reset_postdata();
?>Call methods on the query object
A secondary query has its own result set, so call $related->have_posts() and $related->the_post(). Calling the unqualified global functions in a custom-loop example can accidentally operate on the main query instead of the object you intended to display.
Reset global post data after the loop
Calling $related->the_post() changes the global post context used by template tags. Run wp_reset_postdata() immediately after the secondary Loop, before rendering code that depends on the main query’s current post. The reset restores the global context while leaving the secondary query object available if you need to inspect it further.
Resetting is required even when the secondary Loop appears to work in a simple template. A later breadcrumb, navigation link, comment section, structured-data routine, or template part may read the global post and silently output fields from the last related post unless the context is restored.
Handle an empty secondary query
Secondary queries can return zero results for the same reasons as the main query. Include an empty branch or deliberately suppress the entire component when there is nothing to show. Reset post data outside the branch so the main context is restored whether or not the query produced posts.
Use get_posts() for a simple additional list
get_posts( $args ) is another way to retrieve posts for an additional component. It returns posts from a separate query and does not alter the main Loop. This can be convenient when you want an array to process with foreach rather than a full query object.
<?php
$items = get_posts( [
'posts_per_page' => 5,
'category_name' => 'news',
] );
if ( $items ) :
echo '<ul>';
foreach ( $items as $item ) :
echo '<li>';
echo esc_html( get_the_title( $item ) );
echo '</li>';
endforeach;
echo '</ul>';
else :
echo 'No related posts found.';
endif;
?>Because this pattern returns an array and does not run the_post() for each item, it does not take over the global post context in the same way as a secondary Loop. If you deliberately set up global post data while processing the array, apply the appropriate reset before returning to main-query output.
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Why query_posts() should be avoided
The official developer reference warns that query_posts() “will completely override the main query” and is not intended for use by plugins or themes. It is an anti-pattern for most customization work because it replaces the query WordPress built for the URL instead of modifying that query before execution.
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- URL-derived query variables can be discarded, so an archive, search, or taxonomy request no longer behaves like the page the visitor requested.
- Pagination can become incorrect because the original query’s page and found-post counts are no longer represented consistently.
- Other code that expects the main query can receive a different result set, producing confusing template and plugin interactions.
- The database may be queried again after WordPress has already prepared the main request, adding work without solving a problem that
pre_get_postsor a secondary query handles more cleanly.
If you need to change the requested page, use a narrowly targeted pre_get_posts callback. If you need an extra list, instantiate WP_Query or use get_posts(). These choices make the scope of the change explicit.
Choosing the right customization method
| Goal | Recommended method | When it runs | Main-query state | Reset needed |
|---|---|---|---|---|
| Change which posts an archive or search page returns | pre_get_posts on the targeted main query |
After query variables are created, before SQL runs | Changes the main query by design | No separate post-data reset; preserve pagination and request conditions |
| Show a related or featured list alongside the requested page | new WP_Query( $args ) |
Where the template executes the additional component | Secondary query changes global post context while its Loop runs | Yes: call wp_reset_postdata() after the_post() |
| Retrieve a simple array for an additional list | get_posts( $args ) |
Where the function is called | Does not alter the main Loop by itself | Not for the basic array pattern; reset if you manually set global post data |
| Replace the requested page’s query from inside a template | Do not use query_posts(); move the rule to pre_get_posts |
Not recommended | Overrides the main query and can break URL variables and pagination | Not a safe customization strategy |
Build a customized Loop step by step
Recipe: change an archive’s page size
- Identify the request type that should change, such as a front-end archive.
- Add a
pre_get_postscallback in the appropriate theme or plugin code. - Guard the callback with
! is_admin(),$query->is_main_query(), and the most specific conditional method available. - Set
posts_per_pageor another needed query variable before the query runs. - Visit the archive’s first page and at least one later page. Confirm that the item count, next/previous links, and page boundaries agree.
- Check that unrelated queries, such as sidebar lists and administration screens, still use their own settings.
Recipe: add a related-posts component
- Define the secondary query arguments, including the number of posts and the category, taxonomy, post type, or ordering rule.
- Instantiate
WP_Querywith those arguments. - Check the object with
$query->have_posts(). - Inside the
whileloop, call$query->the_post()before using template tags. - Render the complete repeated card or heading structure.
- Provide an empty branch or suppress the component when no posts match.
- Call
wp_reset_postdata()before any markup that should use the main query’s current post.
Recipe: inspect a Loop without disturbing it
Keep diagnostic checks outside the iteration unless you understand the query state they change. An extra have_posts() call at the end can rewind the query after it reports false. If you need to count, paginate, or inspect results, use the query’s documented properties and methods rather than probing the Loop with repeated availability checks.
Common Loop failures and fixes
Every card shows the same post
Make sure the_post() is inside the while loop and is called on the intended query object. If the call is missing or occurs outside the loop, template tags continue reading the same global post.
A related list changes the article title below it
The secondary Loop changed global post context. Add wp_reset_postdata() immediately after the loop and before rendering the rest of the main template.
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Check that the pre_get_posts callback is running on the front end, tests $query->is_main_query(), and uses the correct conditional method. A callback that targets every query may also be changing a different query, while a callback that checks the wrong request type will never match.
Pagination skips posts or shows the wrong number of pages
Do not replace the main query with query_posts(). Apply filters before SQL with pre_get_posts, avoid an unplanned offset, and test several page numbers after changing the result set.
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The page is blank when there are no matches
Add an explicit else branch for every query that can be empty. A no-results message, search form, or link to a broader archive gives the visitor a usable outcome instead of an empty container.
A custom Loop appears to affect a sidebar or footer
Review where the global post context is changed and whether it is reset. Also verify that a pre_get_posts callback is limited to the intended main query; broad callbacks can alter unrelated loops during the same request.
State, timing, and pagination: the three decisions behind every customization
Target
First decide whether you are changing the page requested by the visitor or adding another component. Main-query changes belong in pre_get_posts; additional content belongs in a secondary query or get_posts().
Timing
If the result set must be different before database retrieval, change query variables in pre_get_posts. If the page already has its main results and you are retrieving another list while rendering the template, use WP_Query or get_posts().
State impact
Ask whether your code changes global $post. A secondary WP_Query Loop that calls the_post() does; restore it with wp_reset_postdata(). A simple get_posts() array does not alter the main Loop by itself.
Keeping these decisions explicit makes Loop code easier to maintain: the main query remains the authoritative representation of the requested URL, secondary queries are isolated, and every change to global state has a visible cleanup step.
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