The number of articles displayed per page is different for different categories of wordpress

Recently, I was preparing to convert the app theme of Tianxing Studio from zblog to wordpress. In the process, I encountered the need for different classification settings and the number of articles displayed per page. After solving this problem, I wrote this tutorial to introduce the next process.

The number of articles displayed on each page of WordPress is set in the background - Settings - Reading - Blog page at most by default, but this is a public configuration, and all categories will use this number. When we need different classification settings and different number of articles to be displayed per page, we have to hang the hook of WordPress, and then call the user-defined value.

The hook to be hung is "pre_get_posts". The detailed code is as follows:

 //Different paging display quantity called by different classifications function tx_wp_filter_pre_get_posts($query) { If ($query ->is_main_query()) {//Judge whether the main query is         $num = ''; If (is_category()) {//Judge whether to classify             $cat_ID = get_queried_object_id(); //Get the classification ID             if (get_option('cat-pagenum-' . $cat_ID) {//Judge whether the category custom field has a value                 $num = get_option('cat-pagenum-' .  $cat_ID);                 $query->set('posts_per_page', $num); //Assign a value to the number of articles per page in the main loop data             }         }     }     return $query; } add_action('pre_get_posts', 'tx_wp_filter_pre_get_posts'); //Hang the hook

Note: The above codes need to be used together with the classification user-defined fields, which will be shared in the future.

If you don't know how to classify custom fields or just need to set a specific classification, you can use the following code to make it easier:

 //Different paging display quantity called by different classifications function tx_wp_filter_pre_get_posts($query) { If ($query ->is_main_query()) {//Judge whether the main query is         $num = ''; If (is_category (array (1)) {//The number 1 is the specified classification id             $num = 2; //The number 2 is the number of articles per page, which can be modified arbitrarily but must be an integer             $query->set('posts_per_page', $num); //Assign a value to the number of articles per page in the main loop data         }     }     return $query; } add_action('pre_get_posts', 'tx_wp_filter_pre_get_posts'); //Hang the hook