wp_get_attachment_image_url()

wp_get_attachment_image_url() — Gets the URL of an image attachment.

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.

Returns string|false: Attachment URL or false if no image is available. If $size does not match any registered image size, the original image URL will be returned.