Additional content for Yoast SEO Content analysis

get-post-content.php

<?php

// Enqueue the custom Yoast Analysis JavaScript in the WordPress admin editor.
add_action( 'admin_enqueue_scripts', function( $hook ) {
    // Only load the script on post editing screens ('post.php' for edit, 'post-new.php' for new posts).
    if ( in_array( $hook, [ 'post.php', 'post-new.php' ], true ) ) {
        // Build the full URL to the JavaScript file in the theme's 'js' directory.
        $script_path = get_template_directory_uri() . '/js/yoast-analysis.js';

        // Enqueue the script with a handle 'yoast-analysis'.
        // Load it in the footer (true), with jQuery as a dependency.
        wp_enqueue_script(
            'yoast-analysis',
            $script_path,
            [ 'jquery' ], // You can add 'yoast-seo-post-scraper' here if needed.
            null,         // No specific version is set.
            true          // Load script in the footer for better performance.
        );

        // Pass useful PHP data to JavaScript via a global object 'pumpkin'.
        global $post; // Access current post object.

        if ( $post ) {
            wp_localize_script(
                'yoast-analysis', // Script handle to attach data to.
                'pumpkin',        // Name of the JS object that will hold the data.
                [
                    'ajax_url'  => admin_url( 'admin-ajax.php' ), // AJAX URL for backend requests.
                    'post_id'   => $post->ID,                     // Current post ID.
                    'post_type' => $post->post_type,              // Current post type.
                ]
            );
        }
    }
} );

// Register AJAX actions to handle requests from both logged-in and guest users.
// This points to the function below that serves the post content.
add_action( 'wp_ajax_codesoup_get_yoast_post_content', 'codesoup_get_yoast_post_content' );
add_action( 'wp_ajax_nopriv_codesoup_get_yoast_post_content', 'codesoup_get_yoast_post_content' );

/**
 * AJAX handler returning the post content plus optional custom fields.
 */
function codesoup_get_yoast_post_content() {
    // Check if the post_id was provided in the AJAX POST request.
    if ( empty( $_POST['post_id'] ) ) {
        wp_send_json_error( 'No post ID provided' );
    }

    // Sanitize and cast the post_id to integer.
    $post_id = intval( $_POST['post_id'] );
    $post = get_post( $post_id );

    // If no post found for the given ID, return an error.
    if ( ! $post ) {
        wp_send_json_error( 'Post not found' );
    }

    // Start with the standard post content.
    $content = $post->post_content;

    // OPTIONAL: Append any custom fields or ACF field content to the analysis string.
    // Example: $content .= get_field('my_acf_field', $post_id );

    // Return the combined content as a successful JSON response.
    wp_send_json_success( $content );
}