WordPress responsive images

function get_responsive_image_tag_for_attachment($attachment_id, $requested_size) {    
    $data = get_responsive_image_sizes_for_size($requested_size);
    $srcset = [];
    foreach($data as $image) {
        $image_data = wp_get_attachment_image_src($attachment_id, $image);
        if ($requested_size == $image) {
            $src = $image_data[0];
        }
        $srcset[] = $image_data[0].' '.$image_data[1].'w';
    }
    
    $image_tag = '<img srcset="';
    $image_tag .= implode($srcset, ', ');
    $image_tag .= '" src="'.$src.'" />';
    
    return $image_tag;
}

function responsive_image_tag_for_attachment($attachment_id, $requested_size) {
    echo get_responsive_image_tag_for_attachment($attachment_id, $requested_size);
}

function get_responsive_image_sizes_for_size($requested_size) {
    $sizes = get_intermediate_image_sizes();
    $return = [];
    foreach($sizes as $size) {
        if (substr($size, 0, strlen($requested_size)) === $requested_size) $return[] = $size;
    }
    return $return;
}