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when a post is shared on Facebook, you can follow these steps:

Step 1: Create the Plugin File

1. Go to your WordPress installation directory.
2. Navigate to wp-content/plugins/.
3. Create a new directory for your plugin, e.g., og-meta-tags.
4. Inside this directory, create a file named og-meta-tags.php.

Step 2: Add Plugin Information and Basic Setup

Open the og-meta-tags.php file and add the following code:

Here’s the complete og-meta-tags.php file with the plugin information, settings page, and basic setup included:

<?php
/**
 * Plugin Name: OG Meta Tags for Facebook Sharing
 * Description: Automatically adds Open Graph meta tags to WordPress posts for better sharing on Facebook. Includes settings for Facebook App ID and Secret.
 * Version: 1.0
 * Author: Professor Web Developer
 */

// Add a settings menu
function og_meta_tags_menu() {
    add_options_page(
        'OG Meta Tags Settings', 
        'OG Meta Tags', 
        'manage_options', 
        'og-meta-tags-settings', 
        'og_meta_tags_settings_page'
    );
}
add_action('admin_menu', 'og_meta_tags_menu');

// Display the settings page
function og_meta_tags_settings_page() {
    ?>
    <div class="wrap">
        <h1>OG Meta Tags Settings</h1>
        <form method="post" action="options.php">
            <?php
            settings_fields('og_meta_tags_settings');
            do_settings_sections('og-meta-tags-settings');
            submit_button();
            ?>
        </form>
    </div>
    <?php
}

// Register settings
function og_meta_tags_settings_init() {
    register_setting('og_meta_tags_settings', 'og_meta_tags_app_id');
    register_setting('og_meta_tags_settings', 'og_meta_tags_app_secret');

    add_settings_section(
        'og_meta_tags_section',
        'Facebook App Settings',
        'og_meta_tags_section_callback',
        'og-meta-tags-settings'
    );

    add_settings_field(
        'og_meta_tags_app_id',
        'Facebook App ID',
        'og_meta_tags_app_id_callback',
        'og-meta-tags-settings',
        'og_meta_tags_section'
    );

    add_settings_field(
        'og_meta_tags_app_secret',
        'Facebook App Secret',
        'og_meta_tags_app_secret_callback',
        'og-meta-tags-settings',
        'og_meta_tags_section'
    );
}
add_action('admin_init', 'og_meta_tags_settings_init');

function og_meta_tags_section_callback() {
    echo 'Enter your Facebook App credentials:';
}

function og_meta_tags_app_id_callback() {
    $app_id = get_option('og_meta_tags_app_id');
    echo "<input type='text' name='og_meta_tags_app_id' value='" . esc_attr($app_id) . "' />";
}

function og_meta_tags_app_secret_callback() {
    $app_secret = get_option('og_meta_tags_app_secret');
    echo "<input type='text' name='og_meta_tags_app_secret' value='" . esc_attr($app_secret) . "' />";
}

// Retrieve Facebook App credentials
function get_facebook_app_credentials() {
    $app_id = get_option('og_meta_tags_app_id');
    $app_secret = get_option('og_meta_tags_app_secret');

    return [
        'app_id' => $app_id,
        'app_secret' => $app_secret,
    ];
}

// Add Open Graph meta tags to the head section of each post
function add_og_meta_tags() {
    if (is_single()) {
        global $post;
        $post_thumbnail = get_the_post_thumbnail_url($post->ID, 'full');
        $post_description = strip_tags($post->post_excerpt);
        if (empty($post_description)) {
            $post_description = wp_trim_words($post->post_content, 30, '...');
        }
        ?>
        <meta property="og:type" content="article" />
        <meta property="og:title" content="<?php echo esc_attr(get_the_title()); ?>" />
        <meta property="og:description" content="<?php echo esc_attr($post_description); ?>" />
        <meta property="og:image" content="<?php echo esc_url($post_thumbnail); ?>" />
        <meta property="og:url" content="<?php echo esc_url(get_permalink()); ?>" />
        <?php
    }
}
add_action('wp_head', 'add_og_meta_tags');

// Use Facebook credentials (Example of usage with SDK)
function post_to_facebook($link, $message) {
    $credentials = get_facebook_app_credentials();
    
    // Example usage: Create Facebook instance using the credentials
    // Replace '{access-token}' with the actual access token when using the SDK
    $fb = new Facebook\Facebook([
        'app_id' => $credentials['app_id'],
        'app_secret' => $credentials['app_secret'],
        'default_graph_version' => 'v10.0',
    ]);

    try {
        $response = $fb->post('/me/feed', [
            'link' => $link,
            'message' => $message,
        ], '{access-token}');
        return $response->getGraphNode();
    } catch (Facebook\Exceptions\FacebookResponseException $e) {
        echo 'Graph returned an error: ' . $e->getMessage();
        exit;
    } catch (Facebook\Exceptions\FacebookSDKException $e) {
        echo 'Facebook SDK returned an error: ' . $e->getMessage();
        exit;
    }
}
?>

Step 3: Activate the Plugin

1. Go to the WordPress admin dashboard.
2. Navigate to Plugins > Installed Plugins.
3. Find the “OG Meta Tags for Facebook Sharing” plugin and click Activate.

Explanation of the Code:

• is_single(): Checks if the current page is a single post.
• get_the_post_thumbnail_url(): Retrieves the URL of the featured image for the post.
• strip_tags(): Removes any HTML tags from the post excerpt.
• wp_trim_words(): Trims the post content to 30 words if there is no excerpt.
• esc_attr() and esc_url(): Ensures that the data is safely outputted in the meta tags.

Customization:

• You can modify the number of words in wp_trim_words() if you need a shorter or longer description.
• You can customize the og:type or any other tags if your website has specific requirements.

Summary:

• Plugin Setup: This plugin adds Open Graph meta tags to each post, which helps ensure that when your posts are shared on Facebook, the correct information (title, description, image, etc.) is displayed.
• Settings Page: The plugin also includes a settings page where you can securely enter your Facebook App ID and App Secret.
• SDK Integration (Optional): The code includes an example of how you might integrate the Facebook SDK to post content directly to Facebook.

This complete file can be saved as og-meta-tags.php in your WordPress plugin directory, and then you can activate the plugin through the WordPress admin panel.