Find closest larger image size that matches $width and $height

gistfile1.txt

<?php

function find_nearest_image_size( $attachment_id, $width, $height ) : string {
    $image_meta = wp_get_attachment_metadata( $attachment_id );
    $size = '';
    if ( ! empty( $image_meta['sizes'] ) ) {
        $last_pixel_count = 0;
        foreach ( $image_meta['sizes'] as $key => $value ) {
            /* image size is smaller than what we need, skip */
            if ( $width > $value['width'] || $height > $value['height'] ) {
                continue;
            }

            /* find smallest size */
            $pixels = $value['width'] * $value['height'];
            if ( $last_pixel_count === 0 || $pixels < $last_pixel_count ) {
                $last_pixel_count = $pixels;
                $size = $key;
            }
        }
    }

    return $size;
}