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What is WP_Query in WordPress?

    https://www.wpbeginner.com/glossary/wp_query/
    WP_Query is a class defined in WordPress. It allows developers to write custom queries and display posts using different parameters. It is possible for developers to directly query WordPress database. However, WP_Query is one of the recommended ways to query posts from WordPress database. Below is an example of a simple WP_Query which displays posts from movies category:

get_post_field() Function WordPress Developer Resources

    https://developer.wordpress.org/reference/functions/get_post_field/
    get_post_field (string $field, intWP_Post $post = null, string $context = 'display') Retrieve data from a post field based on Post ID.

Ultimate Guide to meta_query of WordPress WP_Query

    https://rudrastyh.com/wordpress/meta_query.html
    So, for example, if you want to get a post with meta key show_on_homepage and meta value on, you can do it the following way: $rd_args = array( 'meta_key' => 'show_on_homepage' , 'meta_value' => 'on' ) ; $rd_query = new WP_Query( $rd_args ); Otherwise, if you need to query all posts except the ones with this pair of meta key and value, you can use the following parameters:

get_search_form() Function WordPress Developer Resources

    https://developer.wordpress.org/reference/functions/get_search_form/
    Theme Form If you do have searchform.php in your theme, it will be used instead. Keep in mind that the search form should do a GET to the homepage of your blog. The input text field should be named s and you should always include a label like in the examples above.. Example of a custom searchform.php: <form action="/" method="get"> <label for="search">Search in <?php echo home_url ...

Learn How To Create a WordPress plugin From Scratch

    https://www.wpblog.com/how-to-create-a-wordpress-plugin/
    Apr 26, 2017 · Here is how WordPress Codex . defines WordPress Plugin: . A WordPress Plugin is a program, or a set of one or more functions, written in the PHP scripting language, that adds a specific set of features or services to the WordPress weblog, which can be seamlessly integrated with the weblog using access points and methods provided by the WordPress Plugin Application Program Interface …
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