RICG for Wordpress

_imagesizes.inc.php

<?php

add_image_size( '480', 480, 9999, FALSE );
add_image_size( '768', 768, 9999, FALSE );
add_image_size( '1440', 1440, 9999, FALSE );
add_image_size( '1920', 1920, 9999, FALSE );
add_image_size( '2560', 2560, 9999, FALSE );

_rimage.inc.php

<?php 

$url = $image['url'];
$alt = $image['alt'];
// Sizes
$phone = '480';
$phoneImage = $image['sizes'][$phone];
$tab = '768';
$tabImage = $image['sizes'][$tab];
$landscape = 'large';
$landscapeImage = $image['sizes'][$landscape];
$lappy = '1440';
$lappyImage = $image['sizes'][$lappy];
$hd = '1920';
$hdImage = $image['sizes'][$hd];
$thunder = '2560';
$thunderImage = $image['sizes'][$thunder];
?>
<figure><img
	src="<?php echo $phoneImage ?>"
	srcset="
		<?php echo $phoneImage ?> 480w,
		<?php echo $tabImage ?> 768w,
		<?php echo $landscapeImage ?> 1024w,
		<?php echo $lappyImage ?> 1440w,
		<?php echo $hdImage ?> 1920w,
		<?php echo $thunderImage ?> 2560w
	"
	alt="<?php echo $alt ?>"
	class="ricg"
></figure>

This works great on Wordpress, using Advanced Custom Fields, to get images returned in an array to be displayed responsively.