chatgtp-example.php

<?php
/*
Plugin Name: My Great Plugin
Description: A custom plugin for WordPress.
Version: 1.0
Author: Your Name
*/


/* 
This was generated by ChatGTP with the following prompt:
Create scaffolding for a WordPress plugin called "my great plugin". OOP. Include a custom menu item and a custom admin screen. On the admin screen, add a single text field called "api_key" for saving an option called "api_key". Validate the field for letters only before saving.
*/

// Register a custom admin screen for the plugin
add_action( 'admin_menu', 'my_great_plugin_admin_menu' );
function my_great_plugin_admin_menu() {
    add_menu_page(
        'My Great Plugin', // Page title
        'My Great Plugin', // Menu title
        'manage_options', // Capability
        'my-great-plugin', // Menu slug
        'my_great_plugin_admin_screen', // Callback function
        'dashicons-admin-plugins', // Icon
        99 // Position
    );
}

// Display the custom admin screen for the plugin
function my_great_plugin_admin_screen() {
    echo '<h1>My Great Plugin</h1>';
    echo '<p>This is the custom admin screen for the plugin.</p>';

    // Check if the form has been submitted
    if ( isset( $_POST['my_great_plugin_api_key_form'] ) ) {
        // Validate the API key field
        if ( preg_match( '/^[a-zA-Z]+$/', $_POST['api_key'] ) ) {
            // Save the API key
            update_option( 'my_great_plugin_api_key', sanitize_text_field( $_POST['api_key'] ) );
            echo '<div class="notice notice-success"><p>API key saved successfully.</p></div>';
        } else {
            echo '<div class="notice notice-error"><p>Invalid API key. Please enter only letters.</p></div>';
        }
    }

    // Get the saved API key
    $api_key = get_option( 'my_great_plugin_api_key', '' );
    ?>
    <form method="post" action="">
        <input type="hidden" name="my_great_plugin_api_key_form" value="1">
        <table class="form-table">
            <tbody>
                <tr>
                    <th scope="row"><label for="api_key">API Key</label></th>
                    <td><input type="text" name="api_key" id="api_key" value="<?php echo esc_attr( $api_key ); ?>" class="regular-text"></td>
                </tr>
            </tbody>
        </table>
        <p class="submit"><input type="submit" name="submit" id="submit" class="button button-primary" value="Save Changes"></p>
    </form>
    <?php
}