Wordpress srcset snippet for ACF image field

srcset.php

<?php
  // Use an ACF image field
  // Set the 'return value' option to "array" (this is the default)
  // This example uses three image sizes, called medium, medium_large, thumbnail
  $imageobject = get_field('image');
  if( !empty($imageobject) ):
    echo '<img alt="' . $imageobject['title'] . '" src="' . $imageobject['sizes']['medium'] . '" srcset="' . $imageobject['sizes']['medium_large'] .' '. $imageobject['sizes']['medium_large-width'] .'w, '. $imageobject['sizes']['medium'] .' '.  $imageobject['sizes']['medium-width'] .'w, '. $imageobject['sizes']['thumbnail'] .' '.  $imageobject['sizes']['thumbnail-width'] .'w">';
  endif;
?>

This is exactly what I needed. Much appreciated!

Excellent, thanks verticalgrain! I'd make this edit: <img alt="' . $imageobject['alt'] . '" title="' . $imageobject['title'] . '" , but otherwise this is just great and saved me a headache!