Understanding WP-CLI Commands:

WP-CLI commands are PHP classes that extend the WP_CLI_Command class. Each command is a method within that class, and options/arguments are defined within the method's docblock. These commands can then be executed using the wp command followed by the custom command name.

Steps to Create Custom WP-CLI Commands:

1. Set Up Your Environment:

Before creating custom commands, ensure that you have WP-CLI installed on your system. You can check this by running wp --info in the terminal. If not installed, follow the installation instructions on the official WP-CLI website.

2. Create a Plugin or Use Your Theme's Functions.php:

Decide where you want to place your custom WP-CLI commands. You can create a custom plugin or add them to your theme's functions.php file. For this example, let's create a plugin.

3. Create the Plugin File:

Create a new PHP file for your plugin, e.g., custom-wpcli-commands.php. Include the necessary plugin header and define your custom commands within a PHP class.

<?php
/*
Plugin Name: Custom WP-CLI Commands
Description: Adds custom WP-CLI commands to WordPress.
Version: 1.0
Author: Your Name
*/

if ( defined( 'WP_CLI' ) && WP_CLI ) {
    class Custom_WPCLI_Commands extends WP_CLI_Command {        /**
         * My custom WP-CLI command.
         *
         * ## OPTIONS
         *
         * @when before_wp_load
         */
        public function my_command() {
            WP_CLI::success( 'Hello, this is my custom WP-CLI command!' );
        }
    }// Register the WP-CLI command.
    WP_CLI::add_command( 'my-custom-command', 'Custom_WPCLI_Commands' );
}




4. Activate the Plugin:

If you created a plugin, activate it through the WordPress admin or using WP-CLI (wp plugin activate your-plugin).

5. Run Your Custom WP-CLI Command:

Open your terminal and run the custom command:
wp my-custom-command my_command