Ticket #16031: bulk-action-test-plugin.php

<?php
/*
Plugin Name: Bulk Actions Test
Plugin URI:
Description: Tests bulk actions for all screens
Author: Matt van Andel
Version: 1.0
Author URI:
*/

add_filter( 'pre_option_link_manager_enabled', '__return_true' );

add_action( 'current_screen', function () {

        // The query arg needs to be removed from the REQUEST_URI so the message doesn't
        // persist, see wp-admin/edit.php
        $_SERVER['REQUEST_URI'] = remove_query_arg( array( 'tstbkact' ), $_SERVER['REQUEST_URI'] );

        // Add new bulk action to all screens
        add_filter( 'bulk_actions-' . get_current_screen()->id, 'bulkactiontest_add_bulk_action' );

        // Add new bulk action handler to all screens
        add_filter( 'handle_bulk_actions-' . get_current_screen()->id, 'bulkactiontest_handle_bulk_action', 10, 3 );

        // Display notice after bulk action is handled
        add_action( 'admin_notices', 'bulkactiontest_admin_notice' );
        add_action( 'network_admin_notices', 'bulkactiontest_admin_notice' );
} );


function bulkactiontest_add_bulk_action( $actions ) {
        $actions['tstbkact'] = 'Test Bulk Action';

        return $actions;
}

function bulkactiontest_handle_bulk_action( $sendback, $action = false, $items = false, $site_id = false ) {
        if ( $action === 'tstbkact' ) {
                $sendback = add_query_arg( 'tstbkact', count( $items ), $sendback );
                return $sendback;
        }

        return $sendback;
}

function bulkactiontest_admin_notice() {
        $current_screen = get_current_screen();

        if ( isset( $_REQUEST['tstbkact'] ) ) {
                printf( '<div id="message" class="updated fade"><p>Test bulk action caught for %s items on %s!</p></div>', $_REQUEST['tstbkact'], $current_screen->id );
        }
}

function bulkactiontest_add_removable_query_args($removable_query_args) {
        $removable_query_args[] = 'tstbkact';
        return $removable_query_args;
}
add_filter( 'removable_query_args', 'bulkactiontest_add_removable_query_args', 10, 1 );