How does the WP _ query function work in WordPress?

How does the WP _ query function work in WordPress?

WP_Queryprovides numerous functions for common tasks within The Loop. To begin with, have_posts(), which calls $wp_query->have_posts(), is called to see if there are any posts to show. If there are, a whileloop is begun, using have_posts()as the condition. This will iterate around as long as there are posts to show.

What are the properties of the WP query object?

Properties # Properties 1 $query Holds the query string that was passed to the $wp_query object by WP class. 2 $query_vars An associative array containing the dissected $query: an array of the query variables and their respective values. 3 $queried_object Applicable if the request is a category, author, permalink or Page.

Which is the formal documentation of WP _ query?

This is the formal documentation of WP_Query. You shouldn’t alter the properties directly, but instead use the methods (see methods list below)to interact with them. Top ↑ Properties #Properties

What does the dissected$ query do in WordPress?

$query_vars An associative array containing the dissected $query: an array of the query variables and their respective values. $queried_object Applicable if the request is a category, author, permalink or Page.

How does have _ posts ( ) function in WordPress work?

This function checks whether there are more posts available in the main WP_Query object to loop over. It calls have_posts() method on the global $wp_query object. If there are no more posts in the loop, it will trigger the loop_end action and then call call rewind_posts() method. Related #Related. Uses #Uses.

How to check if an array is empty in PHP?

Whenever we do queries to get some data, it is returned as an object. Then most of us convert it to array for looping through the rows easily. In php “empty()” function is used to check if an array is empty i.e. if it has no data in it. So we can check if returned array representation of query isn’t empty by doing like this.

How to find out what type of request WordPress is dealing with?

The first is to find out what type of request WordPress is currently dealing with. The $is_*properties are designed to hold this information: use the Conditional Tagsto interact here. This is the more common scenario to plugin writers (the second normally applies to theme writers).

How to create custom taxonomy for WordPress query?

You are correct, WordPress decides if you don’t have a term they’ll just ignore your taxonomy. Annotate the SQL used by WP_Query with one of the hooks that let’s you add a SQL INNER JOIN referencing the taxonomy tables.

How does the WP Ajax hook work in PHP?

The wp_ajax_ hooks follows the format “ wp_ajax_$action “, where $action is the ‘ action ‘ field submitted to admin-ajax.php. This hook only fires for logged-in users.

What are the different types of sticky posts?

This includes several different classes of value: post, hentry (for hAtom microformat pages), category-X (where X is the slug of every category the post is in), and tag-X (similar, but with tags). It also adds “sticky” for posts marked as Sticky Posts.

How does the options API work in WordPress?

The Options API consists of eight functions which allow you to add, get, update or delete options: Only $option is required. If there’s an existing record with your $option parameter as the value of its option_name field, WordPress will add your $value to an array in the option_value field for that record, otherwise it will create a new record.

Why is the WP _ options table restricted in WordPress?

As the wp_options table stores data which is related to the setup and administration of the site as a whole, access to it is restricted. To be able to amend settings and options, users will need to have the manage_options capability.

What’s the best way to query a post in WordPress?

For general post queries, use WP_Query or get_posts(). It is strongly recommended that you use the ‘pre_get_posts’ action instead, and alter the main query by checking is_main_query().

How to run a query for one specific page?

So, to run a query fetching just one specific page from the database, you’d use one of these: To run a query for a post of another post type, including a custom post type, you’d also use the post_type parameter.

How are arguments used in WP _ query plugin?

You can query for specific posts and pages or you can run a query to return posts of one or more post types. Before we start, let’s have a quick recap on how arguments work in WP_Query. When you code WP_Query in your themes or plugins, you need to include four main elements:

How do you reset a query in WP?

wp_reset_query () Destroys the previous query and sets up a new query.

When to create a new instance of WP _ query?

Creating a new instance of WP_Query or get_posts () is preferred for secondary loops. If you would like to modify the main query, use the pre_get_posts action.

Can you query for a page or a post in WordPress?

By default WordPress will query for the ‘post’ post type and not return pages or custom post types—if you want to do this you’ll need to add more arguments or use a different argument, which I’ll come to later in this tutorial. Note that the name parameter takes the post slug as its argument, not its title.

Where does WP _ query get its query Vars from?

These are built up when WP_Query instantiates, but fortunately are passed through a filter ‘ query_vars ‘ before they are actually used to populate the $query_vars property of WP_Query.

How to get custom fields in WP _ query?

WP_Query does not return values from any custom fields. To get these you must loop through the posts and get the values of the fields. You can use get_fields () to fetch all acf fields registered at once with the post. Have a look the documentation here.

How to alter the main query in WordPress?

This is the easiest and recommended way to alter the main query. This ‘pre_get_posts’ hook is called after the query variable object is created, but before the actual query is run. query_posts () is meant for altering the main loop.

When to call pre get posts in WordPress?

This ‘pre_get_posts’ hook is called after the query variable object is created, but before the actual query is run. query_posts () is meant for altering the main loop.

How to embed a post in WP query?

In the following code snippet, we create a shortcode function that allows us to embed posts (or any custom post type) and lets us choose whether to show the full post or just an excerpt: $output .= ‘… ‘ .

Which is the sister class of WP _ query?

In the next part, we’ll talk about WP_User_Query, one of the sister classes of WP_Query. See you then! Barış is a WordPress developer & implementer, and founder of Optimocha, a WordPress speed optimization service. Follow him on Twitter or GitHub.

What does not exists mean in WP query?

NOT EXISTS is just like what it sounds – the meta value isn’t set or is set to a null value. All you need for that query is the key and comparison operator:

What do you need for a meta query in WordPress?

All you need for that query is the key and comparison operator: This person needed to query non-existent meta values, and needed them to play nice with others. Hope this helps! Note that when using a meta_compare value of ‘LIKE’, WordPress automatically wraps the wildcard character ( % ) around the meta_value string.

Is there a WP query loop within a loop?

I’m using a couple of custom wp_query loops on my page, the first one retrieves news from a certain category then displays a small excerpt from it with the permalink. The second one is another wp_query that gets a custom post type with a few advanced custom fields.

How to call a plugin function with WordPress?

When I click the generate link I don’t get the same output I get in the wp page as when I go directly to sample-ajax.php in my browser.)

How to query posts by category and tag?

Let us know how you get on, not sure what happens with tags with multiple words in the name. I stumbled into this same issue and resolved it by making a MySQL request . in short : get_post ($args) will return you posts who have the category=MyCategory OR the tag=MyTag. what you want is to change your OR to AND .

How to order posts by category in WordPress?

So I want to order posts by category that are located in a custom post type – support (created thanks to Types plugin, link: ujeb.se/A4zqZ ).