检索面向“横向”图像的函数

function wpse_96012_landscape_image() {

    /* global post object holding info about the current post */
    global $post;

    /* grab all images attached to the current post */
    $attached_images = get_children( array(
        \'post_parent\' => $post->ID,
        \'post_type\' => \'attachment\',
        \'post_mime_type\' => \'image\'
    ) );

    /* set minimum ratio between width / height, change to your liking */
    $minimum_aspect_ratio = 1.2;

    /*
     * iterate over attachments
     * get size, compare width & height
     * stop execution if an image with "landscape" dimensions is found
     */
    foreach( $attached_images as $image ) {
        $url = wp_get_attachment_url( $image->ID );
        $size = getimagesize( $url );
        if ( $size[0] >= ( $size[1] * $minimum_aspect_ratio ) ) {
            return $url;
        }
    }

    return false;
}

因此，如果您想在有图像的情况下输出图像，您可以这样做：

$landscape_image_url = wpse_96012_landscape_image();
if ( $landscape_image_url ) {
    echo \'<img alt="landscape image" src="\' . $landscape_image_url . \'" />\';
}