plugin-development - Read For Learn

Problem creating cron job wordpress

Here’s the minified reference I use for setting up WordPress cron, which is all from wp_schedule_event() and cron_schedules: Setup Cron // SETUP CRON add_action(‘wp’, ‘myplugin_schedule_cron’); function myplugin_schedule_cron() { if ( !wp_next_scheduled( ‘myplugin_cron’ ) ) wp_schedule_event(time(), ‘daily’, ‘myplugin_cron’); } Cron Function // the CRON hook for firing function add_action(‘myplugin_cron’, ‘myplugin_cron_function’); #add_action(‘wp_head’, ‘myplugin_cron_function’); //test on page load … Read more

Proper way to use apply_filters() with class functions?

It depends on you where you want to call apply_filters(). It can be right when you defined the $title: $title = apply_filters( ‘my_hook’, the_title_attribute( ‘echo=0’ ) ); // set echo to false return $title; Or in the return call: $title = the_title_attribute( ‘echo=0’ ); // set echo to false return apply_filters( ‘my_hook’, $title ); Then … Read more

Error getting correct blog_id on MU from functions.php

Compare $current_site->id with $current_site->blog_id. According to the in-line documentation, blog_id should be working … but check to see if there’s a major difference there (your system might have a plug-in or something else causing a problem). Update – Ignore last It seems like $current_site is a global variable defined by your site or network and … Read more

Overwriting Core WordPress Functions with Plugins

Not really, no. You can override built-in PHP functions, but not user-defined functions. However, all this function does is define a meta box. Why not define your own? Once you’ve got your own meta box defined and added, you can call remove_meta_box to remove the standard one: remove_meta_box( ‘add-POSTTYPENAME’, ‘nav-menus’, ‘side’); The meta box is … Read more

Category listing with thumbnail and description on home page

Note: This is for older versions of WP < 3.9 prior to the new media upload being introduced Here’s how to add fields and save the values on the category edit screen as well as a method of adding an image upload field. Adding fields to category edit screen To start we need to get … Read more

How to retrieve a value via get_option when the option_value is stored in a multi-dimensional array?

$term_id = get_query_var(‘cat’); // the current category ID $my_fields = get_option(‘my_category_fields_option’); echo $my_fields[$term_id][‘my_title’]; // the title corresponding to the current category (assuming you’re talking about Any examples of adding custom fields to the category editor?)

A Post is saved twice or more during add_action(save_post)

One of the two IDs might be a post revision. To prevent this behaviour, I always have this checks in my save_postdata function: // Autosave, do nothing if ( defined( ‘DOING_AUTOSAVE’ ) && DOING_AUTOSAVE ) return; // AJAX? Not used here if ( defined( ‘DOING_AJAX’ ) && DOING_AJAX ) return; // Check user permissions if … Read more

How to add HTML / Form to an Admin Bar Menu

I just gave this a shot and it seemed to work fine: function wpse_form_in_admin_bar() { global $wp_admin_bar; $wp_admin_bar->add_menu( array( ‘id’ => ‘wpse-form-in-admin-bar’, ‘parent’ => ‘top-secondary’, ‘title’ => ‘<form><input type=”text” /><input type=”submit” /> </form>’ ) ); } add_action( ‘admin_bar_menu’, ‘wpse_form_in_admin_bar’ ); You’ll have to do some work to gussy it up a bit, but it looks … Read more

Headers already sent error with CSV export plugin

Move your download/output code into admin_init hook. This hook is called before anything is output. It should work. <?php /* Plugin Name: Your Site’s Functionality Plugin Description: All of the important functionality of your site belongs in this. Version: 0.1 License: GPL Author: Your Name Author URI: yoururl */ add_action(‘admin_menu’, ‘my_page_export_menu’); add_action(‘admin_init’,’wpse9876_download_csv’); function my_page_export_menu() { … Read more

function triggered by “manage_users_custom_column” filter not working

I have the same problem on WP 3.2.1. There was a filter conflict because a plugin (User Access Manager) calls manage_users_custom_column filter too. I change priority and it solved the problem : add_filter( ‘manage_users_custom_column’, ‘custom_user_column_value’, 15, 3 ); Hope that helps 🙂

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