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Mastering WP_Query: Actions and Filters

    https://code.tutsplus.com/tutorials/mastering-wp_query-actions-and-filters--cms-23112
    Unlike pre_get_posts, which intervenes with the query before the query variables are set, the parse_query action handles the process after the query variables are set. Thus, you should use this action if you want to check the current variables and take action in …

WP_Query Class WordPress Developer Resources

    https://developer.wordpress.org/reference/classes/wp_query/
    $query = new WP_Query( array( 'category_name' => 'staff,news' ) ); Display posts that have “all” of these categories: $query = new WP_Query( array( 'category_name' => 'staff+news' ) ); Display all posts except those from a category by prefixing its id with a ‘-‘ (minus) sign. $query = new WP_Query( array( 'cat' => '-12,-34,-56' ) );

Three techniques to alter the query in WordPress Press ...

    https://presscustomizr.com/snippet/three-techniques-to-alter-the-query-in-wordpress/
    Oct 23, 2019 · Howdy WP developer! In this snippet, I will describe three different techniques to alter the WordPress default query with an example showing how to add a secondary page to the front page in the Customizr theme. Those are quite advanced WordPress programming techniques, so before diving into it make sure you are familiar with the following concepts :

wp_ajax_query_attachments() Function WordPress ...

    https://developer.wordpress.org/reference/functions/wp_ajax_query_attachments/
    Ajax handler for querying attachments.

parse_request Hook WordPress Developer Resources

    https://developer.wordpress.org/reference/hooks/parse_request/
    do_action_ref_array ('parse_request', WP $this) Fires once all query variables for the current request have been parsed.
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