Run dbDelta for each SQL statement seperately: function myplugin_install(){ global $wpdb; $table_name = $wpdb->prefix . “vehicles”; require_once(ABSPATH . ‘wp-admin/includes/upgrade.php’); $sql = “CREATE TABLE IF NOT EXISTS $table_name ( id INT UNSIGNED NOT NULL AUTO_INCREMENT, description VARCHAR(25) NOT NULL, PRIMARY KEY (id) ); “; dbDelta($sql); $sql2 = “CREATE TABLE IF NOT EXISTS $table_name1 ( … )”; … Read more
Your question is not really about WordPress, it is more about PHP and refactoring. But we see so much bad code here, and the pattern I will explain below (MVC) could help many other developers, so I decided to write a little answer. Keep in mind, there is a dedicated site for such questions in … Read more
Before being printed, all the menu items get run through a filter. You can target the wp_nav_menu_items filter to tack things on to the menu: // Filter wp_nav_menu() to add additional links and other output function new_nav_menu_items($items) { $homelink = ‘<li class=”home”><a href=”‘ . home_url( “https://wordpress.stackexchange.com/” ) . ‘”>’ . __(‘Home’) . ‘</a></li>’; // add … Read more
The same way you would any other: foo(); Active plugins are loaded before the theme files You may want to check that your plugin is activated and the function is available so things dont go pear-shaped if you forget to activate it, like: if(function_exists(‘foo’)){ foo(); } else { echo “oh dear you haven’t activated/installed ‘myplugin’, … Read more
You have to include wpadmin/upgrade-functions.php file to create a table example function create_plugin_database_table() { global $table_prefix, $wpdb; $tblname=”pin”; $wp_track_table = $table_prefix . “$tblname “; #Check to see if the table exists already, if not, then create it if($wpdb->get_var( “show tables like ‘$wp_track_table'” ) != $wp_track_table) { $sql = “CREATE TABLE `”. $wp_track_table . “` ( … Read more
Do not point the URL to admin.php, use admin-post.php instead: ‘<a href=”‘ . admin_url( ‘admin-post.php?action=print.csv’ ) . ‘”>’ In your plugin register a callback for that action: add_action( ‘admin_post_print.csv’, ‘print_csv’ ); function print_csv() { if ( ! current_user_can( ‘manage_options’ ) ) return; header(‘Content-Type: application/csv’); header(‘Content-Disposition: attachment; filename=example.csv’); header(‘Pragma: no-cache’); // output the CSV data } … Read more
Always write plugins for the current version and keep the nightly builds from the upcoming versions in mind. Anything else doesn’t matter. Edit As @toscho pointed out in a comment: There might be some explanation needed to why it is that way. Because I say so. Plugins only need to be compliant with core because … Read more
Yoast’s plug-in is actually a very good example if all you want to do is add menus. Basically, the admin bar is just an alternate set of links to the same plug-in admin pages you have in the sidebar. To add the top-level SEO menu, Yoast does the following: $wp_admin_bar->add_menu( array( ‘id’ => ‘wpseo-menu’, ‘title’ … Read more
In a previous tinymce plugin I made – I set up a custom ajax transport so I could just use the blob right from the image src of a remote img instead of base64 on a data attribute, and then used the REST API to upload the image to the media library in js. Base64 … Read more
The WordPress way of doing this is by not using the admin_post hook at all. Since this question was asked quiet a while ago I wonder if option was available back then. Anyway you should create a custom settings page. Have a look at the complete example in the linked post. You will have to … Read more