一次性更新所有product缩略图的alt

function bulk_update_product_image_alt_text() {
    // Only run once — remove after execution
    if ( ! isset( $_GET['run_alt_fix'] ) ) return;

    // ⬇️ Replace 'your_post_type' with your actual custom post type slug
    $posts = get_posts([
        'post_type'      => 'product',
        'posts_per_page' => -1,
        'post_status'    => 'publish',
    ]);

    $updated = 0;
    $skipped = 0;

    foreach ( $posts as $post ) {

        // --- Featured Image ---
        $thumbnail_id = get_post_thumbnail_id( $post->ID );

        if ( $thumbnail_id ) {
            $current_alt = get_post_meta( $thumbnail_id, '_wp_attachment_image_alt', true );

            if ( empty( $current_alt ) ) {
                update_post_meta(
                    $thumbnail_id,
                    '_wp_attachment_image_alt',
                    'Wheel Hub Bearing ' . $post->post_title  // Uses the post title as alt text
                );
                $updated++;
            } else {
                $skipped++;
            }
        }
    }

    echo "Done! Updated: {$updated} | Skipped (already had alt text): {$skipped}";
    exit;
}
add_action( 'init', 'bulk_update_product_image_alt_text' );

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一次性更新所有product缩略图的alt

function bulk_update...