wp_get_attachment_image()

wp_get_attachment_image() — Gets an HTML img element representing an image attachment. While $size will accept an array, it is better to register a size with add_image_size() so that a cropped version is generated. It’s much more efficient than having to find the closest-sized image and then having the browser scale down the image.

Inputs: $attachment_id (int): Image attachment ID. $size (string|int[]): Optional. Image size. Accepts any registered image size name, or an array of width and height values in pixels (in that order). Default ‘thumbnail’. $icon (bool): Optional. Whether the image should be treated as an icon. Default false. $attr (string|array): Optional. Attributes for the image markup. Field $src (string): Image attachment URL. Field $class (string): CSS class name or space-separated list of classes. Default attachment-$size_class size-$size_class, where $size_class is the image size being requested. Field $alt (string): Image description for the alt attribute. Field $srcset (string): The ‘srcset’ attribute value. Field $sizes (string): The ‘sizes’ attribute value. Field $loading (string|false): The ‘loading’ attribute value. Passing a value of false will result in the attribute being omitted for the image. Default determined by wp_get_loading_optimization_attributes(). Field $decoding (string): The ‘decoding’ attribute value. Possible values are ‘async’ (default), ‘sync’, or ‘auto’.

Returns string: HTML img element or empty string on failure.