WordPress Plugin Code Definition

<?php
/*
Plugin Name: Custom Plugin
Description: This is a custom WordPress plugin.
Version: 1.0
Author: Your Name
*/

// Step 1: Define a function to execute when the plugin is activated
function custom_plugin_activate() {
    // Your activation code here
}
register_activation_hook(__FILE__, 'custom_plugin_activate');

// Step 2: Define a function to execute when the plugin is deactivated
function custom_plugin_deactivate() {
    // Your deactivation code here
}
register_deactivation_hook(__FILE__, 'custom_plugin_deactivate');

// Step 3: Define a function to enqueue styles and scripts
function custom_plugin_enqueue_scripts() {
    // Your script and style enqueue code here
}
add_action('wp_enqueue_scripts', 'custom_plugin_enqueue_scripts');

// Step 4: Define a shortcode function
function custom_plugin_shortcode() {
    // Your shortcode code here
}
add_shortcode('custom_shortcode', 'custom_plugin_shortcode');

// Step 5: Define an admin menu function
function custom_plugin_menu() {
    // Your admin menu code here
}
add_action('admin_menu', 'custom_plugin_menu');

// Step 6: Define a function to handle AJAX requests
function custom_plugin_ajax_handler() {
    // Your AJAX handling code here
}
add_action('wp_ajax_custom_action', 'custom_plugin_ajax_handler');

// Step 7: Define a custom post type
function custom_plugin_register_post_type() {
    // Your custom post type registration code here
}
add_action('init', 'custom_plugin_register_post_type');

// Step 8: Define a filter function
function custom_plugin_filter_function($content) {
    // Your filter code here
    return $content;
}
add_filter('the_content', 'custom_plugin_filter_function');

// Step 9: Define an action hook
function custom_plugin_action_hook_function() {
    // Your action hook code here
}
do_action('custom_plugin_action_hook');

// Step 10: Define a widget class
class Custom_Plugin_Widget extends WP_Widget {
    // Your widget code here
}
function custom_plugin_register_widget() {
    register_widget('Custom_Plugin_Widget');
}
add_action('widgets_init', 'custom_plugin_register_widget');

// Additional Steps: Add any other functions or hooks as needed for your specific requirements
?>