如何通过图片名称自动为WordPress自定义文章类型添加图片？

Got it, let's break this down and build a PHP script tailored for your Cron Job needs—one that matches your FTP-uploaded car photos to the corresponding "car" custom posts using their license plate custom field.

Here's the step-by-step flow the script will follow:

• Load the WordPress environment to access post data and media functions
• Scan the wp-uploads/car-photos folder for images
• Extract the license plate from each image's filename (e.g., 311111 from 311111-photo-01.jpg)
• Find the matching "car" post using the license plate custom field
• Add the image to WordPress's media library and link it to the post (e.g., set as featured image)
• Move processed images to a separate folder to avoid re-handling

Save this as car-photo-importer.php (place it in your WordPress root directory or a secure, non-public folder):

<?php
// Load WordPress core - update the path to match your WP installation
require_once('/path/to/your/wp-load.php');

// Configuration settings
$photos_directory = WP_CONTENT_DIR . '/uploads/car-photos/';
$processed_directory = WP_CONTENT_DIR . '/uploads/car-photos/processed/';
$custom_field_key = 'license_plate'; // Your custom field key for license plates
$custom_post_type = 'car'; // Your custom post type slug

// Create processed directory if it doesn't exist
if (!file_exists($processed_directory)) {
    mkdir($processed_directory, 0755, true);
}

// Scan the photos directory
if ($directory_handle = opendir($photos_directory)) {
    while (false !== ($file = readdir($directory_handle))) {
        // Skip directories and non-image files
        if ($file === "." || $file === ".." || !in_array(pathinfo($file, PATHINFO_EXTENSION), ['jpg', 'jpeg', 'png', 'gif'])) {
            continue;
        }

        // Extract license plate from filename (format: {license}-photo-{number}.ext)
        $filename_parts = explode('-', $file);
        if (count($filename_parts) < 3) {
            echo "Skipping invalid filename: $file\n";
            continue;
        }
        $license_plate = $filename_parts[0];

        // Find the matching car post
        $post_query = new WP_Query([
            'post_type' => $custom_post_type,
            'meta_key' => $custom_field_key,
            'meta_value' => $license_plate,
            'posts_per_page' => 1, // Assume one post per license plate
            'post_status' => 'publish'
        ]);

        if ($post_query->have_posts()) {
            while ($post_query->have_posts()) {
                $post_query->the_post();
                $post_id = get_the_ID();

                // Prepare image data for WordPress media library
                $file_path = $photos_directory . $file;
                $file_url = WP_CONTENT_URL . '/uploads/car-photos/' . $file;
                $file_mime = wp_check_filetype($file, null)['type'];

                // Insert image into media library
                $attachment_data = [
                    'post_mime_type' => $file_mime,
                    'post_title' => sanitize_file_name($file),
                    'post_content' => '',
                    'post_status' => 'inherit'
                ];
                $attachment_id = wp_insert_attachment($attachment_data, $file_path, $post_id);

                // Generate image thumbnails (requires WP's image processing tools)
                require_once(ABSPATH . 'wp-admin/includes/image.php');
                $attachment_metadata = wp_generate_attachment_metadata($attachment_id, $file_path);
                wp_update_attachment_metadata($attachment_id, $attachment_metadata);

                // Set image as the post's featured image
                set_post_thumbnail($post_id, $attachment_id);

                echo "Success: Linked $file to post ID $post_id (License: $license_plate)\n";
            }
        } else {
            echo "Warning: No car post found for license plate $license_plate (file: $file)\n";
        }

        // Move processed image to avoid re-processing
        rename($file_path, $processed_directory . $file);
    }
    closedir($directory_handle);
} else {
    echo "Error: Could not open directory $photos_directory\n";
}

// Reset WordPress post data to avoid conflicts
wp_reset_postdata();
?>

• WordPress Path: Update the wp-load.php path if your script isn't in the WP root (e.g., ../wp-load.php if it's in a subfolder).
• Image Linking: If you don't want to set the image as a featured image, you could:
  • Add a custom field to the post with the image URL
  • Append the image to the post's content using wp_update_post()
• Filename Flexibility: If your image filenames vary slightly, adjust the explode('-', $file) logic to correctly extract the license plate.
• Logging: The script outputs status messages—you can redirect these to a log file (see Cron setup below) for debugging.

To run this script automatically via system Cron:

1. Find your PHP command-line path (run which php in terminal to get it)
2. Create a Cron entry (use crontab -e to edit your Cron jobs)
3. Add a line like this (adjust paths to match your setup):

   # Run every day at 2 AM
   0 2 * * * /usr/bin/php /path/to/your/car-photo-importer.php >> /path/to/your/import-log.txt 2>&1
   

   • The >> /path/to/import-log.txt 2>&1 part saves all output (success/error messages) to a log file for later review.
4. Ensure the user running the Cron job has read/write permissions for the car-photos and processed directories.

内容的提问来源于stack exchange，提问作者Daniel Iliaguev Harta